I have tried Plasma. Imo, it’s not even close. X11 style touch works OK in Plasma, but the multi touch gestures for navigation isn’t anywhere near as good as Gnome with Wayland. In Gnome, I’m just missing a few quality of life gestures, like being able to swipe from an edge to un-hide the auto-hide dock.
I also tried Plasma Mobile (which was amazing for tablet like navigation), but the hi-DPI scaling was all broken.