So I was informed by proton that they do have GitHub repos for their apps, and this "feature-incomplete" version they pushed to everyone isn't actually on there. So I just obtainium'd the old release and now everything's back to normal.

Spotify did something similar a while back where they just pushed a de facto beta version of their app as a stable release and everyone hated it. It was so bad I just went back to pirating. I was worried this was going to happen again with proton, but luckily crisis averted thanks to GitHub releases.