GNOME, Mate, Pantheon, XCFE, KDE, Deepin, UKUI, LXQt etc. created an unmaintainable mess of competing forks _while all using stacking window managers_. It's maddening how similar they all are to each other. Someone should build a dating site where understaffed Linux projects can find a matching project to merge with.
Well, it’s great to experiment. And gnome 2 for example worked really great. I guess I am thinking more in the realm of things like “force touch” gestures, multi touch swipes and such. They could be useful as an added bonus for power users, but I think the traditional paradigm for the OS should work by default:
1) on desktop, single/double click, drag and drop, tool tips, mouse wheel.
2) on mobile quick tap, tap and hold, basic swipe gestures (on mobile these work well but sometimes not intuitive).
I’m probably missing some stuff, but I think people out to at least be able to “feel” their way around a UI. Lately there’s been so much push for minimalism like omitting scroll bars and such that make it confusing.
But, again that experimentation will root out what works and doesn’t. And new devices like VR of course have yet to be discovered paradigms.