Yep. I didn't mean to imply that all webapp development was done on Apple platforms, either. In fact, what I really meant, but worded poorly, was that it's really a very specific subset of the developer "community" that: a) thinks "all development is web development" and b) "web development" is ideal when done on Apple platforms.

My experience mirrors what you have explicitly stated--most development, web app or otherwise, isn't done on Apple products.