If more ranks are added its good enough but still there are few things that sergeants can enjoy
notification chat. If someone makes spam notification he will be demoted
vip chat participation if possible. or at least spying
Just these two for now which I would like to see implemented.
More can be recruiting new members. Launching wars. Generals can promote upto sergeants. Conquest war approval system.
I donot know yet but I hope sergeants can start watch tower upgrades and collect them