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Steam no longer supports Windows 7, 8, and 8.1
(www.neowin.net)
This is a most excellent place for technology news and articles.
I hate to break it to you, but Linux isn't as accessible as many people make it out to be. Sure, the base OS can probably run on more computers, but if you want to talk parity with what somebody needs, there's a darn good chance you'll run into issues.
And at that point, you need to expect the person to learn a new operating system, and one where user experience tends to be the last thing developers think about...
Same can be said with any operating system, even any piece of software.