Apple intuitiveness: Upgrading OS X results in downgraded components

I just upgraded my OS X to Snow Leopard (yeah, a bit late), first of all I just can't wrap my head around the idea that OS X runs on a single hardware configuration (ok, maybe 3) yet it took over an hour to install, while Windows runs on millions of hardware configurations and can install in 15 mins (as in, ready to start using it), I just can't find that intuitive, it doesn't make sense; but anyway, one of the 3? 'big' features in this update is Safari 4, before installing I noticed I already had Safari 5, so I went ahead and did the install, to my surprise when it finally finished I had now Safari 4!! WTF? over an hour upgrading and they couldn't check if the components had a higher version than the one being installed? To be honest I was afraid to check if there was something else that got downgraded. Upgrading OS X results in a downgrade of it's components! how's that intuitive?
To top if off, after upgrading I went to check for updates, there were 776MB of updates (and these are the people who make fun of Windows updates?), and sure enough, Safari 5 was on the list.

So, to recap: I had Safari 5, I upgraded OS X, it got downgraded to Safari 4, then I had to get a 776MB update to get back to where I was before the upgrade. Intuitive or not, I'll let you be the judge xD.

Update. after another 10 minutes, more updates came up, this time an additional 200MB, requiring, of course, that I reboot again.