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Just for clarification to settle a dispute on the rules.

On a model that has two Melee weapons but four attacks, The player chooses the weapon he makes the attacks with does he not?

Just as, a model with one attack but two weapons. Does he make one attack with both melee weapons or does he choose one weapon to make one attack?

From page 183 of the Warhammer 40,000 8th edition Rulebook (Choose Melee Weapon):

If a model has more than one melee weapon, choose which it will use before rolling the dice. If a model has more than one melee weapon and can make several close combat attacks, it can split its attacks between these weapons however you wish – declare how you will divide the attacks before any dice are rolled.

Exactly what I thought. Thanks

But some weapons say "you can make an additional attack with this weapon". Then you need to use that specific weapon.

Kall3m0n wrote:
But some weapons say "you can make an additional attack with this weapon". Then you need to use that specific weapon.

Well, it needs to be used once in order to make that additional attack...

For the most part you don't. Most such weapons state "When the bearer fights, it can make 1 additional attack with this weapon." There is no requirement you any other attacks with the weapon, just that you bear it and you fight.

 Charistoph wrote:

Kall3m0n wrote:
But some weapons say "you can make an additional attack with this weapon". Then you need to use that specific weapon.

Well, it needs to be used once in order to make that additional attack...

Actually, it does not. Please don't spread false information.

BRB FAQ wrote:Q: A chainsword has the following ability: ‘Each time the bearer fights, it can make 1 additional attack with this weapon’. If, for example, a Khorne Berzerker is armed with a chainsword and chainaxe, does he make two attacks with the chainaxe and then one additional attack with the chainsword, or does he have to split his attacks (making at least one attack with the chainsword) to be able to make the additional attack with the chainsword?
A: He can make two attacks with the chainaxe, then one additional attack with the chainsword.

It's an understandable mistake due to ambiguities in English. Sometimes additional means more of something you already had, sometimes it means something different on top of other things you have.

Luckily, as BCB has pointed out, there is an FAQ that tells us which interpretation is correct!

So when GW shows a bunch of models with dual melee weapons (Looking at you new Primaris LT, and Deathwatch Blackshield) it holds zero advantage over just one melee weapon? Why does GW make models with 2 knives or 2 power swords?

Because it looks good.

In 7th you had one additional attack if you had two identical melee weapons, which i liked. In 8th two melee weapons of the same type have no advantage rules wise, the second is wasted, you better get a ranged weapon, or a SS. There are some exceptions, like chainswords, lightning claws, which have special rules.

 FezzikDaBullgryn wrote:
So when GW shows a bunch of models with dual melee weapons (Looking at you new Primaris LT, and Deathwatch Blackshield) it holds zero advantage over just one melee weapon? Why does GW make models with 2 knives or 2 power swords?

With the new Phobos LT, it doesn't actually have any melee wargear as such. Every model in the game is assumed to have some means of making melee attacks, even if they don't explicitly have wargear for such. For the LT, the knives are that weapons. Tactical Marines also often carry knives, but they're basic enough that they don't require additional rules in game.

In the specific case of the LT again though, it actually does have special rules to represent the fact it has many knives, and knows how to use them!

All that aside, yes generally speaking having multiples of the same melee weapon has no benefit, though there are exceptions. Tyranid Scything Talons for instance.