GNOME looks like it is touch friendly, but try to run it on a tablet and it's really fucking not. I had to DL a bunch of tweaks tools to make it useable at all and now the tablet breaks whenever there's a Gnome update that the tweaks weren't designed for.
I run Gnome on Debian on a tablet, and I find it wonderful.
Of course, my only points of comparison, so far, are iOS, Android and Windows tablets. Gnome is (per my own arbitrary last use of each) quite a bit nicer than any of those, at least.
Honestly I'd say the worst part is the osk. They need to treat it a bit more like phosh does. It's sooooo far behind when compared to modern device osks. Sure there's some extensions to help it out, but they don't go far enough to make it decent on a tablet. And it feels incredibly clunky to use with gdm when signing in, where no extension can help it..