- We just need someone to break away clean from the cancer that is Gnome/GTK and friends. Qt and KDE is does not count ...
There's a very good alternative in development - check out V OS - https://v-os.dev/ - it is attempting to port the Be / Haiku GUI and SDK on to Linux, and even though it's still an alpha-beta release, the experience is really good. Unlike GTK's "clunkiness", Be/Haiku GUI feels so buttery smooth, and consumes so little computing resource (compared to GTK or Qt). As they aren't re-inventing anything new, I have high hopes for it. It just needs more support from all of us to thrive.
I am going to sound very ungrateful at sight of anything new given the state of affairs, but I will bite. I think UI kits are as much a matter of taste as it is a technical concern and the screenshots provided does not "do it for me", not in that it is missing what I want but it has things that just won't fly for me, for example those hanging title bar controls, I could probably remove them, but it is not a good start.