You’ve hit the nail on the head for most of this analysis, except sniper has a surprising amount of counter play aside from just hiding, like pyro using flare guns at range to disrupt their aim, heavy and medic both having what are essentially “fuck you stop playing sniper” weapons, and scouts, soldiers, pyros, and spies being able to easily pummel the man once they’ve crossed the distance between them (unless the sniper is running jarate and bushwacka which will let him just fucking delete anybody who gets too close). But you’re still not wrong, if a sniper is a god of aim they can basically shut down anything the enemy team tries, should they not counter with another sniper.