Valve are one of the major reasons that Microsoft’s attempts at the iOSification of Windows failed. Their investments in Linux are directly aimed at preventing what Apple is doing.

Tim Sweeney is a freeloader depending on companies like Valve to protect him from these threats to his company.

I thought this was ridiculous but the kitty cuddles while playing sold me.

FWIW Plasma 5.27 works very well on Wayland with AMD GPUs. The fact that desktop mode uses x11 is probably not related to them still using Plasma 5. I would guess once KDE announces an LTS version of Plasma 6 (possibly as early as 6.2?) they’ll upgrade Steam OS to that.