Way too many times I have looked at a helmet and armor combination and have been like "Wow! These'll look great together." Only to be wildly disappointed that a certain pointy bit or collar clips through the other pieces horribly. And you could say "Oh well those pieces aren't in the same set. They weren't made with each other in mind." And I would say "Sure that's a valid point. But wouldn't it be nice if there were certain parts of the armor you could toggle on and off to make them fit? Yeah it would."