The problem with your line of reasoning is that Linux is not an OS. It's a broad ecosystem of components that get assembled into distributions. I have used the word ecosystem deliberately, because it's very similar to any of its biological counterparts.
Things evolve in a pretty organic way. The advantage of this is the lack of a central authority and much more resilience. It's a bit like the Internet. But obviously, there's some room for improvement in terms of user experience.
Ideally, I think this should happen through some loose standards and RFCs, pretty much like it occurred for the Internet.
With that said, the overall user experience is very good if you stick to a pure GNOME desktop. KDE and Xfce are also pretty good. Personally, I prefer running just X and three applications (Firefox, Emacs and XTerm). This way simpler, and there's almost no common UX at all. Just three very different platforms with very well known conventions (hypertext, Emacs applications and text, respectively).
Things evolve in a pretty organic way. The advantage of this is the lack of a central authority and much more resilience. It's a bit like the Internet. But obviously, there's some room for improvement in terms of user experience.
Ideally, I think this should happen through some loose standards and RFCs, pretty much like it occurred for the Internet.
With that said, the overall user experience is very good if you stick to a pure GNOME desktop. KDE and Xfce are also pretty good. Personally, I prefer running just X and three applications (Firefox, Emacs and XTerm). This way simpler, and there's almost no common UX at all. Just three very different platforms with very well known conventions (hypertext, Emacs applications and text, respectively).