Doesn't device=all already imply device=dri?

If you turn both of those off, you'll see what it's actually like without dri access. (It's pretty bad.)

I don't understand why this game needs device=all though. It doesn't use any other than dri, to my knowledge, unless there's a plugin for mic chat or something.

Doesn't device=all already imply device=dri?

I don't know that this is true or not. The docs aren't very clear on this.

I can only really report that performance was enhanced after turning on the device=dri explicitly. device=all has always been turned on in this instance, so anecdotally (take with a grain of salt) it appears that device=all doesn't imply access to dri.