During the x11/wayland transition, there are some games that fail to launch if you're running them in wayland. This is likely to improve, but it's a good idea to have an x11 backup for games that crash. I use sway, but I keep xfce around for a few games that I don't feel like troubleshooting.
Example in my current setup, any game that relies on unity runs just fine when I'm using xfce or i3, but won't start when I'm running sway. Since it just takes a few seconds to switch to a different DE/WM, that's what I'm doing for now. I'm sure that in a year or two it'll all be smoothed out.