I had issues with Freesync, if I opened an X11 session at launch then it worked with only one screen connected, but it was reliable and didn’t need any further tinkering.
If I launched Wayland first and then switched to X11, my screen would get locked on a random value. I’d have to either cycle compositing on/off, or enable the TearFree flag in xrandr.
In the end Wayland gaming got improved on Plasma 6 so I no longer use X11