I upgraded from 3080 to 9070 XT and couldn't be more happier.
- FSR 4 is as good as DLSS, with Mesa 25.2, ProtonGE and OptiScaler it's easy to use in most games needing FSR, officially supported or not.
- 16G VRAM means never be anxious about 10GB limit again.
- No issues on Linux at all, Wayland just works, game performance is as good as Windows, Steam Big Picture is smooth.
- HDR, VRR just works. (HDR needs gamescope or ProtonGE with two environments variables, both works perfectly.)
- LACT is easy for tweaking the GPU.
- Setting 70% power limit to 9070 XT makes the GPU mostly silent, and still much better performance than 3080.
I had the same issue with mergerfs + nfs, and fixed by following the official doc here