If you want extra security turn it on or you want windows or any game (looking at you vanguard)to shutup about security boot being off
The only problem with security boot if you care about this is that it's managed by Microsoft(most of the time)
Give Cinnamon/Budgie a shot, (I recommend in a vm and see which one you like)both are based on gnome(cinnamon personally its like a combination between gnome 3 ane xfce).
I have the same experience with kde personally(Like it crashes sometimes,looks dated,etc it didnt crash that badly for me), and I decided to desktop hop to Cinnamon.
Mostly Beamng (ik not software but game using windows Vulkan/native Linux and a note that my de doesnt have good wayland support at this time )