Ugh, it's just such a frustration. I put people onto us over the internet and they ask me which mouse button they're supposed to push, and I'm just at a loss to help, because my mouse only has one button, and the keyboard buttons one is supposed to hold to get the context menu are different too.
More seriously: David's argument is strengthened somewhat by the fact that there are still places in the universe where a few more bits worth of download can be very expensive (for example, to a teacher in orbit or an astronaut in a developing nation. Or maybe Scratch that, reverse it.)
For most newcomers, the all-in-one reduces friction. For most experienced users, it's a pain in the ass and a waste of bandwidth. These two facts put tension on what to release. I'm very grateful for the all-in-one, and the people who make it possible. I think with Frank's continuous integration, we should be able to have the cake and eat it too, though, but that's just a thought.
--Casey