It’s about fair play. If some see fog to a point they can’t see the end of their gun, and other players do not see fog at all it ruins the game play, very frustrating to get killed by a player who has no fog on their end and you see nothing but white, just get rid of it completely, or ruduce the time it is active.
How about a gas attack fog (limited time) ,that forces both sides to put on masks to fight, that would equalize the problem of some seeing fog and others not.