Funnily enough earlier today I checked the status of Wayland on my setup- Arch - with KDE and my main issue is still mouse gestures. Currently using easystroke, which is itself an abandonware, but until I find something that works under Wayland I can't change yet nomatter the quality of DEs etc.
Yes and something akin to easystroke would have to be implemented in each compositor under Wayland. You are thus dependent on the window manager you want to use to implement it. I asked the maintainer of the window manager I would want to use whether they would accept a PR for something like that and they said no, they would not.
So, I would have to maintain a fork of my window manager and compositor to keep using something like easystroke under Wayland, instead of using a finished tool that hasn't needed any significant maintenance in 7 years. All in the name of ‘security’.