Could someone explain to me how it enhances gameplay for the first bullet on rifles ( and some other weapons) not to be 100% accurate?

Because especially at long distances, and this happened a lot in breeze (one of the reasons I hate the map), you will aim dead on someone's head, shoot and miss purely because of RNG. What is the point of adding unavoidable RNG to a competitive game? If I am having an aim duel with someone over a long distance I want to win because I clicked his head first, not because his shot magically missed and mine magically hit. I've had situations where I accurately click their head twice in a gunfight and miss for no reason while they slowly wear me down with body shots.

I am not trying to get this to change, I just genuinely would like to know if there is a real gameplay reason for this or if it was just a random decision. Also please don't tell me "guns irl aren't 100% accurate either" that's not a very smart argument imo.