Without it they are terribly slow and easy to kill, and no HET makes any with torpedoes useless, and with grand cruisers i currently do not see battleships being viable in the least, they allready have an achingly slow rotation speed, with no option to increase. like in BFG 1 (which would make a good fleet upgrade IMO)
Secondly theres no way to quickly select multiple Control groups.
For example pressing shift 1 and 2 wont select control groups 1 and 2 like in other games this results in a bit of awkwardness atleast on my end. Also the ability to set abilities on auto cast like 1 (like boardings etc)