GNOME on touchscreens is in a weird place -- everything it needs to be perfect is right there. But there are a handful of pain points and weird bugs that make me think none of the developers are actually using it on a touch device. The OSK is the worst offender.
I still prefer it over KDE on my 2-in-1/convertible laptop, though. Despite the jank it also irons out a lot of the pain points that more traditional desktops have with touch, and is clearly made with it in mind, even when the execution is iffy.