I think there's a distinct philosophical thing going on here which I can completely understand, and actually agree with. (In the sense that, yes, you own it so you SHOULD, therefore, be allowed to open that sucker up and do whatever you want with it)
On the other hand... I don't know how nor do I ever want to, manually service my car, my cooker, my tv or a hundred other appliances. And I think Apple are aiming for the iPad to be an appliance, something that non-techies can work.
I gave up on PCs several years ago when I realised that I was doing more work keeping the thing in proper working order than I was in actually using it for real work.
Seriously: in what world should you need to know how/why or when you need to edit your registry? That's just mad.
-pj