What about wp_pointer_warp_v1? That should be supported in some compositors. But not sure how to actually "send" the click event.
I often try a session with Labwc/LxQt instead of my Openbox/LxQt, and while there is progress, still not fully usable, so still no Wayland for me. But with X11, I can at least add xvfb, xdotool, and other utils, and AI has no problem writing (and testing) a GUI for me.
Oh wp_pointer_warp_v1 works fine when you want to move the cursor that is not a problem. One application can simply say move the mouse to a different window but it cannot say click.
So in the sense as far as I understand it is that in wayland one application is not allowed to use the input of IO devices to interact with other applications.