Bought it today, had 90 minutes of fun, then game crashed and wouldn’t start again. Couldn’t find a fix that worked. I am in Linux so I assume that’s a big part of it but I still had to return it :(
If you don't rename/delete that folder between Proton version changes, files relating to both versions will combine, which can sometimes cause it to not run as it should. Local save games might be stored in there as well, so don't delete the folder before making sure your progress hasn't been lost (it's also in Steam Cloud but sometimes deleting local save games can result in sync problems).