I‘d say I‘m very proficient with FPS games. I also got to Global Elite in CS:GO. My take is that you mainly need two things, map awareness and aim. The first can only be acquired by playing A LOT. The latter too but the time it takes by playing gamemodes line Free For All Deathmatch where you get to practice the shooting aspect very frequently.
If taken seriously I‘m confident a player can get proficient within 500-800 hours of playtime. That sounds like a lot but with daily practice/playing ofr 1-2 hours its not that big of a deal.
And talent. CS is one of the first times in my life I saw people try very hard at getting better. But it just didn't work. Like some people put in a fourth of their effort and they would still run circles around them.
If taken seriously I‘m confident a player can get proficient within 500-800 hours of playtime. That sounds like a lot but with daily practice/playing ofr 1-2 hours its not that big of a deal.