I won't deny that controls are an issue. That's just a pure constraint, it's a fact. But in my edit I mentioned that that is being overcome in the market.
Controls are just one side of gameplay. Also, if we stick to mobile phones I am constrained by controls, but that is no longer an issue if we consider steam and other arcade/dd platforms.
You asked me why I consider Console gaming and Mobile gaming vastly different markets and that's what I did. Steam is PC gaming which is closer to console gaming.
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