It's almost like skills transcend who is the best point-clicker.
It's a great base for any FPS. CSGO isn't the best way to assess it, though. That would be a duck hunt aimbot program where players just reacted to some target over and over like hunters shooting clay. For FPS it's quite useful. The obsessive focus on aim mechanics produces players robust in that skill like athletes possessing exceptional power for strength/speed sports (which is most commercial sports). That athlete can be expected to do well in almost any of them given some practice. Nevertheless, although he might be the best in one, or near the best in more than one, he won't be the best (or elite) in them all.
That has more to do with skill than talent. To be the most "skilled"? Well, that is assessed by who wins. Furthermore, skill itself can be roughly quantified by the accuracy with which you can predict who will win a match based on who has won past matches. This is why almost all carnival games purposefully neutralize the skill component, and you can't predict who will win any game with confidence regardless of practice or talent.
Of course, you could look at ELO (a raw mathematical predictor of winrate) and nothing else to determine which games have the highest "skill" component, but that is also imperfect, because skill isn't something that is consummately evaluated by winrate, but also winrate respective to other winrates. After all, baseball teams have extraordinarily low winrates compared to other team sports, or golfers compared to tennis players, but nobody would argue that baseball players or golfers are unskilled. In fact, I doubt you'd find many who would argue their sport less skill-intensive than basketball or tennis. I'm certain you'd discover a strong correlation between baseball players arguing baseball requires more skill, and basketball players arguing the contrary.
Go ahead. Ignore this widsom. Bundle yourself in your nice, cozy, ignorant little bubble where CS:GO players are the most skilled gamers in the world at every fps, and not merely the one game they play.