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Not sure how to sum this up in a concise title, but this is referring to models which have additional attacks representing mounts, such as cavalry and chariots. I'll use the Fateskimmer as an example:

The rules for the Fateskimmer include the Lamprey Bite, representing the Screamer mounts, which have the following rule:
After a model riding a Burning Chariot makes its close combat attacks, you can attack with its mount. Make 6 additional attacks using the weapon profile Profile is irrelevant here

Now is there anything stopping me from actually using the Lamprey Bite profile for all my attacks? The Chariot and Screamers are all one unit. While the description notes that the model is armed with the Ritual Dagger, it also notes that it is drawn by Screamers that attack with Lamprey Bites, ergo surely the unit as a whole is equipped with Lamprey Bites and can use it for all their attacks, not just the additional 6?

As you have clearly noted, the Model is armed with a Ritual Dagger. It is not armed with Lamprey's Bite. You therefore cannot use Lamprey's Bite for the model's attacks.

Some later versions of mount rules are better written. Thunderwolf Cavalry are armed with Crushing Teeth and Claws that grant 3 attacks with the weapon each time the bearer attacks and no more than three attacks can be made with the weapon.

But the unit as a whole is armed with a Ritual Dagger and a Lamprey Bite. I agree that some units have been written with this possible loophole in mind.

From the 'Abilities' section of the Lamprey Bite statline:

After a model riding a Burning Chariot makes its close combat attacks, you can attack with its mount. Make 6 additional attacks, using this weapon profile.

If you're making all of your attacks with the Lamprey Bite, you're breaking this rule. You would need a rule that allows you to make all of your attacks with the Lamprey Bite.

Normally the mounts have a weak attack whilst the rider has a much stronger one, so you may have identified the one unit in the game where this actually matters

Even still, the profile is clearly separated out to show what attacks the rider has and what attacks the screamers have. You can maybe argue over RaW but I think the intention is pretty clear.