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Microsoft wants you to talk to your PC and let AI control it
(www.theverge.com)
This is a most excellent place for technology news and articles.
The GUI? Sure. Check out Zorin OS. Not to your liking?There's others.
Steam? Mostly, yes. If you have a specific game in mind, a quick Internet search will answer that for you. In my case, 98% of games run (incl. most AAA games).
Good news: you don't need anti virus on Linux (at least not at this point in time). If you really want to, there's decent options. But I yet have to encounter an infected Linux machine. Infected Windows machines, on the other hand, are easy to find. With Linux, your security will go up considerably, coming from Windows.