I guess in a vacuum each of those skills is easy to build up through practice and self-learning (which, lets remember, many people struggle with to begin with).

I guess in a vacuum each of those skills is easy to build up through practice and self-learning (which, lets remember, many people struggle with to begin with). However, I think the fact that you refer to people possessing all of them as "unicorns" should be telling as far as how trivial it actually is to build all these skills beyond a simply passable level.