A new server just for people who dont like the aggro indicator... seriously?
As long as there is no PvP without confirmation message i see no reason for more extra servers.
Developing, updating and balancing each version will take a lot more teams.
You cannot please everyone, can not make 10 versions of a single game…
If someone does not like the way it is, there are other games.
For small things like agro indicator, UI and so on, SE simply could add a option menu where you can select or turn them on/off.