It's annoying.
I've been using Xpadder for a 360 controller on my PC for a lot of games, and have remapped every game I play using the controller so they have the same buttons for similar things. FNV is the only game that doesn't match the others due to the lack of a 2 hotkey.
Again, I think this was change for the sake of change and reinventing the wheel but only so you can paint it a different colour.