As someone who was completely ignorant to x and wayland until recently, my only experience is my distro having a wayland and x combobox during login, and random things not working when I switch it to wayland. The only reason I know this option even exists is because wayland was on by default and random stuff didn't work. I'll happily switch to the new better tech once it stops breaking stuff like KDE Connect and random games.
I use an app on my phone that lets me use it as a touchscreen and keyboard for my Linux media PC. I have no idea if it will ever (be able to) support Wayland.