Currently here isn't any action bind to three finger swipe function. So I think it can be used to quickly switch between virtual desktops, just like macOS. For example, the user has 2x2 virtual desktop. desktop 1, desktop 2 desktop 3, desktop 4 Start with desktop 1. 3 Finger Swipe left, switch to desktop 2. 3 Finger Swipe up, switch to desktop 4. 3 Finger Swipe right, switch to desktop 3. 3 Finger Swipe left bottom, switch to desktop 2.
These are implemented on Wayland, but not on X11.
Done on Wayland; not feasible slash out of scope for X11. Closing, sorry. :)