OBS can't screen record (it segfaults instead), I can't copy-paste, and I can't see window previews unless everything implements a specific extension to the core protocol.

I can't take articles like this seriously when they so confidently make such statements that so directly conflict with reality. I use Wayland exclusively everyday and I screen record with OBS on both KDE and GNOME on multiple machines with no issues, my KDE shows window previews, and copy pasting works fine. Maybe the author's problems aren't Wayland issues?