On the contrary, I have a 1440p 120Hz primary monitor and a 4k 60Hz vertical side monitor, and I can only seem to make that setup work with Wayland. I've been using only Wayland this whole time as a result.

As for all your issues with it:

• I'm able to record my screen just fine with multiple applications. Are you trying to write your own screen recorder, or use existing ones?
• I have not had any issues with fullscreen. If anything, it works better for me than Windows. (I can't compare it to X11 because I can't use X11.)
• I don't really understand what you mean by having a clipboard. Do you not have one on Wayland somehow?
• Hotkeys seem to work for me, so I'm confused here too.
• I'm not too sure what you mean by "manufacture inputs" but my keyboard supports programmable macros and that works for me, though I believe that works by flashing the keyboard instead of through software.
• Programs I use often use their own themes regardless of Wayland/X11 so the client-side decorations doesn't matter nearly as much to me. I would like it to be more consistent, but that's on both sides (Wayland+application devs) to figure out.

The rest of these aren't issues I've had to deal with at all, but I can see them coming up. Wayland does have some issues, but nothing I've come across that's major enough to bother me all that much.