Apple Stores aren't the only way that Apple offers support, it's one of many. Just because it didn't happen to be convenient for one of your scenarios doesn't mean it's not convenient for thousands of others.
Also, from what I can tell, Onsite warranty support is a paid upgrade for Dells, not a default. I could be wrong on that, though, haven't bought a dell in a while. Apple does also support onsite warranty support for some computers if you pay more as well. So I'm really not sure what the point of your comment is.