PoE2

Path of exile 2 just works though? It even has a vulkan renderer.

missing HDR, vrr

That depends on the compositor you're using, support is still relatively new but it works just fine on GNOME and KDE.

Which distro are you using?

I have faith that proton development will continue to rectify these shortfalls. Windows has had dominance for decades allowing game devs and tools to work to Microsoft. Windows games used to require tinkering as well back in the beginning before and shortly after Direct X.

The ProtonDB compatible tier system helps form an assessment of any capabilities that aren't working. I would agree that running at 1080p is compatible for me. For me, those features are not show stoppers and potentially game specific. RE:Village has HDR support for example. And with the database comes a community effort to fix common issues. Example with Indiana Jones and the Great Circle and the NVIDIA employee providing the command line argument to solve a driver issue.

Ultimately, proton has enabled me to drop Windows and for that I'm thankful.