Definitely, but I look at it from the direction of "No one has pulled in the good UX/UI people to do open source work" and that's simply a social/culture problem.

I also think it's completely fixable, because all the reasons to do open source programming work apply to UI/UX work. Getting your work in front of a lot of people, gaining experience and notoriety, getting to scratch your own itch.

There just was no Linux for design people to jump start that culture. And Mac's always had such nice design that they didn't have as many itches to scratch.