zlacker

Many (maybe even most) native game ports on Linux use a WINE-like compatibility layer. So-called 'source ports' are rare.

Any kind of port can be of high or low quality, though.

>>pxc+(OP)
So it might be they're using an outdated version of Wine, whereas leaving it to Steam means you get the latest Proton version?

>>mcv+Jw2
Not exactly. I don't think those proprietary compatibility layers are generally (ever?) based on Wine, since Wine is LGPL. But they might have different bugs than Proton does, and in some cases they may have more bugs that affect a given game.