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.
Nothing has really changed for Nouveau yet.
A while back they released an open-source kernel driver for Turing and later (well, really they moved most of the driver to an on-GPU processor called the GSP, and released a kernel driver that’s a shim between the GSP and the userspace driver), and that opens the possibility for better open-source drivers in the future (Collabora is working on an open-source Vulkan driver for Nvidia, NVK, and Nouveau is working on making use of the GSP firmware), but it hasn’t changed anything for practical purposes yet.