My thread!!!! Yes, just because it's on steam doesn't mean it's easily portable between different OS. Square would already have to be leveraging the Source Api for any ease in portability. FFXIV uses Square's proprietary Crystal Tools Engine, I believe. In one of the interviews concerning the Mac client, a middleware solution was cited. We don't know which middleware Square is using, much less is known if that middleware works on any linux distro. But still, I hope at least Square considers SteamOS. At least have a client for the OS.