Honestly, because troubleshooting gets annoying for me when I want to play a game, I have made a brain-dead algorithm for how to play games on the deck, and it looks like this:
Do I want to buy it on Steam? If not,
Does it run in Windows? If yes, just download and install in Windows PC, and then (Warpinator) it into the deck. Add shortcut to steam, use latest stable proton. That’s it. You’re done.
W-wait… It doesn’t run natively on Windows? (Old af games like Touhou 6). Just Bottles it, and finagle with the setup a bit, that’s gonna take some effort.
As a general rule, proton is a beast, and I have stopped bothering with Linux native piracy entirely.
It’s become my primary gaming medium, and to be honest, it earned it’s price from the amount of time I initially spent setting up shit, which was a blast. Easily 50 hours of setup and installations before I clocked 10~20 hours of gaming, and I loved every second.