There are some hardware reasons, but mostly as far as I know it's because apple are software Fascists.
so, unless apple give you the go-ahead, your software won't work on their OS. This means they can tightly control compatibility and hence software clashes and also prevents random downloads etc from the web fucking things.

A decent techie can keep a PC running optimally by cleansing it properly and not installing certain thing, but most people can't be arsed so eventually your PC just keels over because of all the shit on it.

I dunno. I use both. Apple also completely pisses on anything else as a user interface too, and that's enough for me for certain things.
( the mighty badger Aphrodite, on a bar stool, by your side, Mon 13 Dec 2010, 12:30, Reply)