I'm not discrediting what Valve accomplished with Steam. I think they are one of the most important companies in the industry -- and I'm not a big fan of theirs, either! What I'm saying here is that in terms of overall importance, in multiple markets around the world, in both the console and portable space, Nintendo has been at the top for a few years now. I suppose you can dispute it, but Valve certainly isn't the uncontested number one, in any case. As far as PC goes, absolutely. Outside of that, it gets much trickier.
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Simplicity is the ultimate sophistication.