You're on some loose footing there. If a genius plays both games they'll be better at Starcraft than Civ cause it's faster?
The worlds premier game of intellect has always been chess, and they don't play the world championship with a 90 second turn timer. If you had to play a grand master you'd want the game as fast as possible to reduce the skill differential. The slower it gets played the more certain you are to lose. His best is better than your best so you need to introduce other factors, such as speed.
It seems you're good at thinking quickly but for mine it's wrong to argue that thinking quickly = genius.
I prefer to play games slowly so they're based on skill alone. Many more people prefer to play games quickly so they're based on skill and speed.
As noted 'I'm very much in the minority. It depends on your personality.'
We have different personalities so prefer different things, and may have to agree to disagree here. Hopefully we can resolve these differences sometime on the battlefield like normal, reasonable, fully grown, world domination obsessed dictators.