Near enough every game has the ability to change their configs. Some commands are restricted and cannot be changed without the server allowing so for example in CS with sv_cheats 1 commands are blocked until sv_cheats has been enabled.
Everything that gets edited in the config is 100% legit otherwise it would’ve been blocked already. I have one of the top range PC’s and I still never got above 100 FPS where on the newest Battlefields I can reach a solid 125 on Ultra, so what is the issue? Optimization.
If people need this config to play the game then so be it, it should and will always be allowed so the new comers to the game can actually play it without raging about the low FPS and performance.
tl;dr - If you don’t like it, stop moaning because it’s legit.