Also until very recently, users bought the OS on DVD and installed it on gigantic hard disks.

Now, Apple optimizes for distribution over the Internet and installation on SSDs. That is also why Mac OS X no longer ships with that printer driver DVD.

You don't say.

True, forgot about that, since it was almost always out of date and not worth using. In any case, it didn't get installed by default, so I think the point still stands.