Neither is the ability to eyeball distances. It's just a matter of practice. I think I managed to pick it up by the time I was a teenager.
It's tough to find the right word for it. Because yeah, it's not complicated. Neither are using stratagems together to set up combos. And yet some people don't pick it up until they've personally experienced it or been told about it. Typically beginners to the game have the most trouble with stuff like that.