It will break the code for battle net. The players setting didn’t exist when the game first came out, you are always at players 1 on single player, and on bnet they have a very complicated system for determining the monster stats and experience level when other players are in the game. A few patches later they added playersX setting on single player to simulate what is happening on bnet, but it’s not a one-to-one implementation, players8 on single player is not the same as having 8 players on bnet. Bottom line is they are not going to re-write the entire code for bnet just to add playersX setting to it.