I don't have many issues with wayland itself, the problem is that I frequently use software that doesn't support wayland or has buggy wayland support. In some instances, I can file bugs with the maintainers of that software, but sometimes (especially with older games) you are just stuck with something that wasn't designed for wayland and there's not much to do about it. Xwayland helps sometimes, but it can only do so much.

To be clear, I don't want or expect KDE to have full first-class X11 support forever. But right now, I can launch an X11 KDE session that's pretty janky and doesn't support things like HiDPI properly and etc if I need to get something running. If they remove that, then I'm unfortunately forced to move elsewhere.