I replaced my 3080 Ti with a 7900 XTX, reinstalled Tumbleweed to start fresh, and KDE on Wayland has been running great so far. Before, visual glitches galore, GPU refusing to output a signal if iGPU is not blacklisted, hardware video decoding outright does not work, etc.
Now, with AMD, I have not yet experienced graphics-related issues in weeks, fingers crossed.