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Honestly anything that doesn't get ported to wayland is probably old enough that it doesn't really make sense to use as your primary desktop anyway. The most niche DE I regularly use is NsCDE, but it's entirely FVWM scripts and FVWM is planning on adding wayland support. It'll be a little sad to lose things like Trinity, WindowMaker, and Afterstep, but they were never amazing anyway and either way I doubt X will actually be unusable for a long time still.
I miss bspwm, none of the Wayland compositors work quite the same. Hyprland is close, but it's just not quite as good. I moved to Wayland for the security benefits, but I miss X11/bspwm.
The worst part is there's no standardization around screenshots/screen sharing/etc. so every DE/WM in Wayland has to be supported separately, or implement wlroots; which restricts how the software can be written.
The second statement is not true, the standardization is flatpak portals and they by now cover almost every aspect of the system. The screenshot api is this: https://docs.flatpak.org/en/latest/portal-api-reference.html#gdbus-org.freedesktop.portal.Screenshot