Why in a BB would you push anymore ? you get spotted from space by CV and attacked, then burned to death by fire starting Cruisers then face DD's while getting long range shot at by enemy BB last thing that can get you will be a SUB if you stay at the back. If you do decide to push if real lucky and spot the CV get lucky salvo blat it, you can blat a Cruiser 1 shot , you can even blat a DD, so great Idea lets add a enemy you cant kill. It gives a BB player great joy in the end of a game killing a CV that has hit you all game, but add a enemy that cant be killed ? yep BB will stay at back or stop playing them altogether. I do see games been a CV couple of crus DD and SUBS, I will see how it goes if this does become normal line ups less chance I will bother playing (personal choice but most games you can kill all enemies imagine playing fortnite and having a player you could never kill :) )