SDL Still Has A Number Of Issues To Address Before Defaulting To Wayland
Well known Linux game porter Ethan Lee presented at this week's X.org Developers Conference (XDC2021) with the ongoing work to bring SDL's Wayland support up to parity with X11 that it can be the default.
Ethan argues that SDL's "Wayland driver is really close to [being] done" but that some items remain. The remaining work includes keyboard and text related bugs, Wayland surface management still being sort of "weird", and other related items. Some of the Wayland issues are already resolved or at least close to being resolved for the next SDL release. Many of the blockers can be viewed and discussed via this GitHub pull.
The good news is that while not yet the default, switching to the Wayland driver is quite easy... Simply using the SDL_VIDEODRIVER=wayland environment variable prior to launching your SDL2-using game/app. Testing the Wayland support across a wide variety of games/applications is also part of the process before they will switch over the default.
Those interested in more information on SDL's Wayland progress, see Ethan Lee's XDC2021 presentation embedded below along with the slide deck.