Well, the thing is that developers need to go out of their way to intentionally break Linux support. The community does 99% of the work in most cases. Launchers, along with anti-cheat are the most egregious.
Anti-cheat I can semi-understand, the developer has to do some work, but popular anti-cheats support Linux no problem.
Launchers, however are 100% useless other than Steam itself, I wish Valve would ban third-party launchers. I wouldn’t be surprised though if some publishers would pull their games from Steam if Valve outright banned them.