Ben Skeggs at Red Hat has long been the primary Nouveau DRM kernel driver maintainer for keeping this open-source NVIDIA GPU kernel driver within the mainline kernel going… Throughout all the battles, particularly after the GTX 900 series and later has required signed firmware images for enabling any accelerated GPU support, he’s now resigning from maintaining the driver. Ben Skeggs has contributed to the Nouveau project for more than one dedace – he’s earned references on Phoronix since 2008.
Some things i can think of (for Wayland)
plymouth will either display in a very low res or not at all on nvidia systems
no smooth dm-de transitions
occasional graphical errors (although these barely exist on my hardware anymore)
taints kernel by loading an out-of-tree module, which breaks some stuff
for foss purists, oss drivers aren’t as fast as proprietary by a large margin (although nvk looks promising)