Great advice! I have always tried to tell people, if at all possible, ALWAYS focus cruisers and DDs FIRST, for the most part, the amount of damage from A TEAM focus firing them, won't be recovered. And overall the amount of fire coming in will scare them, or make them run from their current position. A team that eliminates the enemy DDs or cruisers FIRST can typically win. And I say this as a DD main.
BBs can use RP and tank a lot more, damage mitigation is a thing.