Literally everything u said applies to basically ANY activity which a human does with concentration. There is not a single competitive activity which doesn't require some form of skill, memory and intelligence.
Point is, chess is absolutely no different than any other competitive activity
Yes, I completely agree with you here. And my point is that, given that everything else is equal, more intelligent person would do better in chess then someone less intelligent. But in real life everything is rearly equal and actuall work put in to a skill is often better then just being smart.
people who are VERY GOOD at chess appear to be smarter than others, but aybe the opposite