Great to see this perspective from a developer and it totally makes sense. I think the Firefox browser has encountered essentially the exact same thing. Linux support may be a strategic advantage for devs that embrace it.
That does not mean that every developer will find the same thing though. Proton and Unity have many, many Linux specific ( or at least non-Windows ) bugs I am sure. It would be easy to bemoan these. It takes a different kind of mind-set to see working around these kinds of issues as valuable. Even rarer are devs that take the opportunity to address bugs in the underlying tech ( outside the game - eg. in Proton ).
I suspect though that many non-Windows bugs are actually due to defects in the game. They are just not manifesting yet or in the same way. The fact that Linux exposes these is again an opportunity in the way the author of this post points out.
In other words, cross-platform deployment is an opportunity for a stronger product. Access to an engaged community with strong communication skills and technical chops is a bonus.
Hopefully more devs start to see the world this way. Great article.