I'm not sure what you're getting at with Unity devs not committing to Linux ports except using Unity. They're Unity devs, of course that's how they do their Linux versions. It's also how they do their Windows, Mac, iOS, Android, and console versions.
If you mean devs in general, then sure. People writing their own engines aren't necessarily supporting Linux. But games in Unreal Engine, Unity, and CryEngine are a huge chunk of the market, and all three now play nice with Linux.
If you mean devs in general, then sure. People writing their own engines aren't necessarily supporting Linux. But games in Unreal Engine, Unity, and CryEngine are a huge chunk of the market, and all three now play nice with Linux.