I've been impressed that typography on Linux isn't as bad as Windows, but it's still got a long way to go to measure up to Apple. It's not just clarity and accuracy of the typefaces themselves, but subtle details like how the ligatures (things like how "fi" and "ff" are rendered) are properly applied.

Typography is one of those things that, once you've seen it, you can't un-see it. You can only try to not care.

Apple's not interested in adding USB to the iPad since Bluetooth already does anything USB can do and more, at least from the perspective of a consumer. If you want a portable USB-capable tablet, maybe you want a Surface Pro. That thing would be pretty awesome if someone can Linux it.

In any case, you can already use pretty much any Bluetooth keyboard you want, and there are a large number of third party ones to pick from.