Why does every Apple update require a restart?

I vaguely remember a time when OS updates didn't require a complete restart every time you installed one. Why is it the case now? I have had 3 updates in the last 3 days and 3 restarts. The last one was updates to Quicktime, iLife Media browser and iDVD. None of which I would consider a critical components. OK Quicktime might have something in it but I doubt it.
UNIX is a great because of it modularity and the ability to update components without shutting everything else down. That's what makes it a great server platform. Yes I know occasionally the kernel and other core components need patching and in those cases a restart is required but why oh why does every Apple update of late require a restart?
Whomever answers (preferably from Apple) please be as technical as you like. I would much rather a real answer than bull.
Message was edited by: Slobbo
Message was edited by: Slobbo

Well, you dont have to believe it but that's what's happening. Many updates don't modify critical system files, but those that do will require a restart. Not all updates to QuickTime, for instance, have modified critical system files, so they've not required a restart. However, the latest version does do this, so the restart is required.
Likewise with iLife, the media browser is a core utility that is shared by the system and many applications and it's installation will require a restart. There are other similar shared resources as well which can get updated from time to time.

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