I have kde + Wayland on Arch, and everything works just fine even with my Nvidia card. About 1.5 years ago there was a bug big Wayland update that changed it from literally unusable to good but maybe a little buggy. Now it's as stable as anything I've ever used.
I use spectacle for screen shots without issue. Switch windows, desktops, snapping windows, etc works perfect for me. Other features you mentioned I can't personally speak to, but not having all of the features on a rolling release is to be expected with anything. It's early phases were bad though.