we done this one already didnt we

Many people like the current battle system, many don't.
splitting battle system styles would crush the game. Ok, we would easily know which servers would work best, but new comers who click on a random server may not be so lucky. Also, that would mean future patches would not apply to some servers, players would miss out and feel cheated.

Many people want PvP, many don't.
There is no pvp in this game. Tbh, I see little reason for it anyway as all cities are in good standing with each other.

Many people want aggro-indicators, many people deem them a disgrace upon all things holy.
Yes, you do have a point on this one. however, why not simply have an option: indicators on/off. Setting up entire servers just for indicator options would be a bit overkill