Oh cool, had no idea unreal was that nicely integrated with Linux, I guess PUBG has no excuse then haha. I might go ask my friend if I can go try it on his Vive, good luck!
still always depends on how they code their lower level stuff and yeah, the publisher's will and market ;)
Have a play with UE in Linux and test for yourself as well its capabilities in the platform of your choice. Full engine code is also available in GitHub.