Well, sticking with the analogy you're falling back to a taco made from different ingredients rather than just a part of the burrito. That can be intrusive if they decide to put chicken instead of ground beef in it.

More concretely, it's using a totally different tool to get a subset of functionality you want vs other solutions.

Personally I don't see a reason why one would do that, but more power to you if you do. If anything, ordering the taco sometimes is going to give you a more refined palette than if you got the same burrito each time (i.e. more experience in the problem space you're working in).

(I'm getting hungry now...)