I’m on KDE Plasma with Nvidia and Wayland with the proprietary 530 drivers but really the experience (due to Nvidia’s own fault) doesn’t feel polished at all although it’s very smooth, but the fact of having to be constantly switching between Xorg and Wayland because one or another program doesn’t behave the way it should in Wayland (frameskipping, blank screen, tearing) and I was thinking if using the open source drivers could fix something or make it worse.
I remember testing the open source drivers some time ago and running the Terraria compilation for Linux was not working well at all, and that being a native Linux compilation, maybe the Proton version would have worked better.
I’ll speak on the GPGPU side as it’s a very underrated aspect. You can’t do CUDA with the opensource drivers and Nvidia will never help in that regard, because they rely on their licensing to force datacenters to buy high-margin datacenter GPUs like the A100 and H100 because the license of their proprietary drivers says you don’t have the right to host instances with consumer GPUs.
The CUDA limitation alone makes buying an Nvidia card completely pointless if you’re going to use opensource drivers.