GNOME supports multitouch gestures, and the GTK4 toolkit is overall very touch-native. It strikes a nice balance between overpadded and touch-accessible, IMO: https://www.gnome.org/
(some of the newer Libadwaita widgets that GNOME is using: https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/wid... )
> How does it compare to an ipad in terms of fidelity / responsiveness
With Wayland, it's borderline identical.