I've used Wayland (via sway) for multiple years including on machines with a 1060 and 5080 (mainly for good fractional scaling support). The only major issues I've had with it have to do with XWayland apps. I think there are some issues with providing a consistent experience with things like screen recording, 3rd party proprietary apps, etc. across different DEs/distros, but that's more of something that comes with the territory of Linux.

> I can't copy-paste, and I can't see window previews unless everything implements a specific extension to the core protocol

Sentences like this make me wonder how frequently the author has tried Wayland and what his specific setup is. I mean I understand experiences may vary, but I have such a different experience then him. I've had issues with Wayland, but I've also had issues with X.

> But the second actual users are forced to use it expect them to be frustrated!

Canonical and Red-Hat are not "forcing" you to use Wayland anymore than X only apps "forcing" me to use X (via-XWayland). They are switching to Wayland because they feel like they can provide a better experience to their users for easier with it. You're more than welcome to continue using X, and even throw a few commits its way sometime.