Apple has never actually built a mouse with 2 distinct switches for left and right click. It's like they are too proud or something and "right" click needs to be faked for some reason.
Right now, I'm using a Steelseries one with a Mac. All six buttons and the scroll-wheel work fine.
Yes, I'm aware of that. When I last seriously used MacOS X it was still the PPC era, and while technically you could use a 2 button mouse it wasn't really designed for it. Anyway, compared to other complaints that's a minor gripe of mine.
I don't quite think this is true. I'm pretty certain that MacOS 9 had a right click menu if you plugged in a two button mouse; I've used MacOS since version 6 and I recall distinctly right click being a novelty in OS 8.
Apple's philosophy always was that context menus could aid other workflows in the program, but couldn't replace them -- the functionality had to be accessible in some other way. Which, I thought, certainly makes sense if 90% of your users have a one button mouse. Could this be what you're thinking of?
Nope. Plug in a two button USB mouse and it just worked.