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plenty of reasons.

First of all, they are like hippies, they want to be all nature-loving. Presumably making robots goes against that.

They've been around for awhile. We've seen in 40k that at least with humanity, AI is incredibly dangerous. In the real world, many consider AI to be dangerous and quite likely a mistake to create. Eldar have probably already learned that lesson sometime in their history.

That being said... I don't see why they don't use more drones, like the Tau. Perhaps they see it as a waste of their technology (which is also art, in a way, and made from a kind of growing plastic IIRC), or something but I don't see what the harm in having low-level drones or guided missiles would be.

I think it has to do with the Eldar being tied up on the concept of the Soul. They're entire existence is predicated on the fact that Slaanesh wants their souls, and that everything they do must ensure that their souls remain intact and un-eaten.

That can very easily morph into a view that things without souls are abominations, especially when you consider their long-running animosity with the Necrons. While nothing stops the Eldar from building a gun drone, they, more than anyone else, are aware of "slippery slope" scenarios,

Oh yeah and I forgot to mention, powering everything by psychic means keeps their tech from being reverse engineered to some extent. Chaos could reverse engineer AI if they got their hands on it.... very bad scenario.

 Meade wrote:
Oh yeah and I forgot to mention, powering everything by psychic means keeps their tech from being reverse engineered to some extent. Chaos could reverse engineer AI if they got their hands on it.... very bad scenario.

Not entirely. The Imperium seems to know how Eldar technology works, they just can't replicate it.

 Admiral Valerian wrote:

 Meade wrote:
Oh yeah and I forgot to mention, powering everything by psychic means keeps their tech from being reverse engineered to some extent. Chaos could reverse engineer AI if they got their hands on it.... very bad scenario.

Not entirely. The Imperium seems to know how Eldar technology works, they just can't replicate it.

because of the psychic element?

Maybe...or their tech level is just too high for the Adeptus Mechanicus (post-Heresy) to replicate.

 Admiral Valerian wrote:
Maybe...or their tech level is just too high for the Adeptus Mechanicus (post-Heresy) to replicate.

I've heard that some imperial tech is based on eldar tech, like the lasers (and perhaps plasma). I think it would follow that anything that involves psychic control would be impossible for the imperium to replicate, because they don't have the same kind of psychic control as the eldar do. Otherwise, it would follow that if the Admech know how something works, they can't replicate it because either they lack the material or they lack the means of production.

Possibly the concept of robots comes too close to the C'Tan and their transformation of the Necrontyr into robotlike constructions. Fighting the C'Tan/Necrons is the reason of the Eldar's existence in the first place.

They had robots to do every single thing for them pre-fall, leading them to get bored and then leading to the fall itself. Has nothing to do with "not being capable of".

 MajorStoffer wrote:
I think it has to do with the Eldar being tied up on the concept of the Soul. They're entire existence is predicated on the fact that Slaanesh wants their souls, and that everything they do must ensure that their souls remain intact and un-eaten.

That can very easily morph into a view that things without souls are abominations, especially when you consider their long-running animosity with the Necrons. While nothing stops the Eldar from building a gun drone, they, more than anyone else, are aware of "slippery slope" scenarios,

I think this sums it up pretty well.

It isn't unheard of for human psykers to use Eldar technology, and not all of it is psychic based. Anyone could pick up a Shuricat and shoot it.

Inquisitiors in particular like Eldar things. The biggest reason Eldar stuff isn't copied is because of Wraithbone. Thats probably something the Imperium can't replicate.

 Grey Templar wrote:
It isn't unheard of for human psykers to use Eldar technology, and not all of it is psychic based. Anyone could pick up a Shuricat and shoot it.

Inquisitiors in particular like Eldar things. The biggest reason Eldar stuff isn't copied is because of Wraithbone. Thats probably something the Imperium can't replicate.

I was under the impression that Shruicats, had no physical trigger, but instead had a Psychic Trigger.

Being used as pawns does not result in very happy Humans. In fact, the opposite would be the result.

So? That's kept the Imperium functioning so far.

 AegisGrimm wrote:

Being used as pawns does not result in very happy Humans. In fact, the opposite would be the result.

So? That's kept the Imperium functioning so far.

Being used as pawns by your fellow Humans is very different from being used as pawns by aliens. For the former, its for the good of the species. For the latter, its just for their inscrutable ends.

 Sasori wrote:

 Grey Templar wrote:
It isn't unheard of for human psykers to use Eldar technology, and not all of it is psychic based. Anyone could pick up a Shuricat and shoot it.

Inquisitiors in particular like Eldar things. The biggest reason Eldar stuff isn't copied is because of Wraithbone. Thats probably something the Imperium can't replicate.

I was under the impression that Shruicats, had no physical trigger, but instead had a Psychic Trigger.

Not the ones in the RPG

 Hunterindarkness wrote:

 Sasori wrote:

 Grey Templar wrote:
It isn't unheard of for human psykers to use Eldar technology, and not all of it is psychic based. Anyone could pick up a Shuricat and shoot it.

Inquisitiors in particular like Eldar things. The biggest reason Eldar stuff isn't copied is because of Wraithbone. Thats probably something the Imperium can't replicate.

I was under the impression that Shruicats, had no physical trigger, but instead had a Psychic Trigger.

Not the ones in the RPG

As with most Eldar technology, shuriken weapons are psychically activated, constructed of wraithbone which is particularly sensitive to the Eldar's innate psychic mind. For many personal weapons this link is established though the grip and connects with additional systems incorporated to their armour.[4]
Types of Shuriken weapons

From Lexi.

I'll assume that the RPG sacrificed the Lore for integral gameplay mechanics.

Some Humans are psykers too. I'm sure the Adeptus Mechanicus can jury-rig a psychic trigger for them. Not very elegant-looking to be sure, but it might work.

Mayb they remind them of the necrons

A certain stage of technological development in one area does not conclude that technology must be that advanced in all areas. What evidence do we have that the Eldar are even capable of programming AIs? Have they ever needed it? Their 'computers' are all really spaces within which dead souls can commune, there's no reason to believe they have any kind of 'computer' as we'd recognize it from any of the fluff I've read.

 AnomanderRake wrote:
A certain stage of technological development in one area does not conclude that technology must be that advanced in all areas. What evidence do we have that the Eldar are even capable of programming AIs? Have they ever needed it? Their 'computers' are all really spaces within which dead souls can commune, there's no reason to believe they have any kind of 'computer' as we'd recognize it from any of the fluff I've read.

Without computers they would have a very hard time to build even the most primitive spaceships. Since using souls is seen as necromancy, which is only used in exceptional situations, we can at least assume that the Eldar have at least some kind of purely mechanical computer. The existance of AIs on the other hand is unknown. Perhaps they had some before the Fall, perhaps not.

 Sasori wrote:

 Grey Templar wrote:
It isn't unheard of for human psykers to use Eldar technology, and not all of it is psychic based. Anyone could pick up a Shuricat and shoot it.

Inquisitiors in particular like Eldar things. The biggest reason Eldar stuff isn't copied is because of Wraithbone. Thats probably something the Imperium can't replicate.

I was under the impression that Shruicats, had no physical trigger, but instead had a Psychic Trigger.

And then you have the fact that their are examples of Eldar weapons have a filled soul stone of a family member that will kill someone not of the family that picks it up.

The Eldar Codex has clear mentions of the fact that most of the technology they have has some form of psychic design to it.

OP: the answer is rather simple and logical, the survivors of the Eldar race know the effects on the Eldar when they are not focused by tasks, the fact that the Eldar had an empire mostly directed and controlled by machines is what lead to the Fall. This is why current Craftworld cultures steer clear of automation and that the Eldar follow the Paths.