BLACK SCREEN FIX

Although the game doesn't run nearly as well as it did when GE-Proton7-55 worked, there is a fix to the black screen that happens when trying to enter a server as it's just failing to show the EULA agreement thing.

Switch your Steam Deck to Desktop > Start game > Attempt join a server > Accept EULA

You can now restart in gaming mode and now you should be good until the next major update that requires you to accept an updated EULA.

My OLED deck used to average 60 - 90 FPS (on low) on GE-Proton7-55 but now that the game only works with GE-Proton9, I haven't been able to get higher than 35-50 FPS (on very low) with terrible frame drops depending on where you are on the map (currently on the Mannibus map). That being said I don't know anything about optimizing on Linux and I'm not even sure if the Launch Options I have listed are even written correctly.

Hopefully, some more experienced Linux users can tackle the performance of the current "Way of Winter" update version of the game now that there is a work-around to the black screen error.