Linux port if there is one is usually done by a third party porting studio, which is not necessarily at the same quality as the original codebase. Also the devs just don't have the manpower/bandwidth to spare for Linux users given how small this community is.
It's better value for money for both the gamers and the devs if the devs just choose to engage with valve and get their game running perfectly under proton.
It's better value for money for both the gamers and the devs if the devs just choose to engage with valve and get their game running perfectly under proton.