>Also, at least in my opinion, the very limited nature of the total set of states relative to the total set of states in something like an RTS lends itself to repeat engagement and analysis. You can, and likely will, see exactly the same board position in more than one chess game.

This makes it reactive, rather than proactive. Reactive judgments are driven more by depth of knowledge, habit, and memorization. Whereas proactive judgments are driven more by predictive/entrepreneurial reasoning. Both seem equally driven by calculated risk with a little psychology involved.

Ancillary skills are important in start craft, I'll give you that. But at least in DotA those skills could be learned by anyone relatively quickly. I don't play video games any more so no other examples come to mind unfortunately.