I've been playing Squad fairly frequently for a long time on Linux, usually without issue. Most game aren't technically supported, but they work perfectly fine, as long as the devs don't purposefully block it. With that said, I'm pretty sure OWI has said they actively support Linux now, with them recently adding support for Squad44 too.

(The current playtest this weekend for the next big update to UE5 won't let me join servers though, and I'm pretty sure it's an issue with Linux support.)

I also wouldn't say it's a strategy game in first person. Certainly that is a way some people will be playing, but most are playing an FPS, just much slower paced than most, and where you need to follow orders and work together to be effective.