I wish KDE worked well on Touch screens. It seems to really fail at that. Don't tell me it's X11. X11 on Gnome doesn't think my touches are a mouse. KDE thinks it is though.
A bunch of their touchscreen implementation work is Wayland-only, because it would've been a lot of work to retrofit it on X11. It's well possible that the GNOME devs invested more time into X11.