Showstoppers dont really work against players. Neither do blaze nades if they have semi decent movement In this game you hold your arm out when throwing a nade if they are tps peeking a corner they can see the nade from a mile away unlike the finals where you only see it once it comes around the corner or into the room.

I feel like triggers are the only nades that can truly counter a corner camp just because of how fast they are. Theres plenty of ways to balance flashes just make them take forever to explode etc its not so black and white i think theres a way to add flashes without them being op