Apple's inconsistent interface

Sean over at Ditto asks, "...why does Apple keep seemingly arbitrarily changing the interface for specific apps?" It's a legitimate question. He has posted a screenshot of Safari, iTunes 5, Mail, VoodooPad, SubEthaEdit and GarageBand all running at once, their windows stacked one on top of the other. Granted they aren't all Apple applications, but the difference between iTunes 5 and Mail alone is significant.

I certainly understand that Apple has the opportunity to tweak and adjust the interface to their applications, and that they can't revise all the applications to "match" changes made to one. Still, enough people have complained about it to confirm that it's more than just Sean and me.

So, what's your take, TUAWers? Does this type of thing drive you nuts?

[Via Ditto]