I've been running Arch with KDE under Wayland on two different laptops both with NVIDIA GPUs using proprietary drivers for years and have not run into issues. Maybe I'm lucky? It's been flawless for me.
The experiences always vary quite a lot, it depends so much on what you do with it. For example discord doesn't support screen sharing with Wayland, it's just one small example but those can add up over time. Another example is display rotation which was broken in kde for a long time (recently fixed).
