vulcthe only time genetics is really a factor is if like someone is born without proper control over their muscles or some other low percentage thing. But for the most part becoming a top player all comes down to attitude and mentality and not genetics. There’s really not much “natural talent” for stuff like tf2 and what some people think are talented players are actually just players who practice better than them.
One of my favorite stories is about a csgo pro (taz I think?) who’s one day decided to start playing league and became a top50 player in about 6 months, he had the proper mentality and knew the proper way to practice and because of this he would most likely be able to become a top level player in any game he played
there are plenty of players that mge more, play the game more, scrim more than best players that still can't reach their skill level. some players can hit that level and some will never get to that level.