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Better Wayland support across the board, but also more Wayland compositors and window managers from which to choose. I'd make my own but I know so very little about Wayland right now and it would take me a while to learn.
Also, I have always wanted desktop environments to be more like Emacs, i.e. to be fully programmable in a Lisp language like Common Lisp or Scheme, where you can just whip-up a GUI app for anything you want in a few minutes with a few lines of code. Operating systems like that existed back in the 1970s and 80s, but went extinct when Windows and Macintosh took over everything, which were never designed to be programmable by end users. It sucks because there hasn't been anything like it ever since.
To see what I am talking about, check out the historical preservation projects for Lisp Machines like the InterLisp Medley desktop environment or the CADR ZMacs editor.
A better "desktop as an IDE" experience would be killer to me too. Even if it's not for everyone, I think as an accelerator for FOSS designers of Linux desktop apps it would be cool
Maybe Arcan will be a thing to experiment with.