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So if you snipe through a wall, instead of sending the location of the shot source and direction, the server has to do slightly more work - calculate who got hit and what noise everyone should hear, but then the client doesn't need to know the location of the firing player.
I know it's not the only way to cheat, but the fact that the client has all the information has to be a large factor.
There are pro players who get caught cheating, this game is rotten to the core.
Valve doesn't seem to care because apparently, players don't care about cheaters since they are so addicted to gambling with skins.
This is fun? If it's eSports for $$ I understand the incentive, otherwise pretending to be good, all the while likely having not a twinge of irony hit you as you 'git gud the opposition... It's a mindset I don't understand.