I’m with you as a Linux user but let’s be real, Linux support has an abysmal ROI: you put a lot of effort for less than a 1% increase in sales, it’s a no brainer.
One of the gifts that valve gave to the Linux ecosystem is having freed developers from the Linux burden. They just make windows games and voila for the most part they run on Linux. They spend less money, we get more games - win/win.
There are a bunch of games that had half-baked Linux ports and got so much better once you could just run the main build through proton, it doesn’t make sense to push developers to go back to native.