pulling the concrete friction-report referenced in the reply https://news.ycombinator.com/item?id=35316159
(these are not necessarily the same issues, but at least similar-sounding ones I found by googling)
• widgets opening in wrong place: https://bugs.kde.org/show_bug.cgi?id=459188
• ignoring icon size configurations: https://gitlab.freedesktop.org/wayland/wayland-protocols/-/i..., closed as wontfix
• on touchscreen menus open wherever you left the cursor: https://bugs.kde.org/show_bug.cgi?id=406025, more info in https://github.com/PeterCxy/evdev-right-click-emulation/issu...
• cursor framerate issues: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/1827 maybe, it's in the gnome issue tracker but described as wayland-specific, so might also be happening on KDE
• firefox using wrong screen's DPI: https://bugzilla.mozilla.org/show_bug.cgi?id=1632829, resolved by original reporter but last comment is a repro from someone else. also reported in https://github.com/flatpak/flatpak/issues/5300 but closed as "wrong bug tracker"
• fullscreening a video rotates it from portrait to landscape: https://bugzilla.mozilla.org/show_bug.cgi?id=1600962 possibly, https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/190522... possibly
In general wayland seems too buggy for major software like firefox to use it by default, per https://askubuntu.com/questions/1409389/why-doesnt-firefox-r...
Impressive list to hit in only 5 minutes!