If Nate thinks that wayland only on Plasma 6 is the way to go then I feel like we as a user should trust him.
Currently I use AMD hardware and for me KDE + Wayland is fantastic experience. Some crashes here and there, with which I’m fine with.
My brother is running Fedora Kinoite + Wayland with Nvidia and he is total noob when it comes to Linux. He is happy and never complained about his system.
So, I would only assume for normal use case wayland is already in good shape currently. It is only going to get better with plasma 6.