I may have found a use for destroyers. I need to test it more. It's not a particularly great use, but it is something.
I have found Titan's are extreme weapon magnets, as they should be tbh. I was trying to find a way to increase their survivability, so I decided to stop putting them in my battleship fleets and started putting Titan's into their own fleets. I figured this would also increase their effectiveness for major battles because I could have every aura going in said battles. This worked relatively well, I saw an immediate increase in survivability. But I didn't have enough fleet cap to fill out the entire fleet. I tried throwing some battleships in to fill it out, but that reduced the survivability again. Not by a lot, and not necessarily absolutely. I did not extensively test everything I'm posting over dozens or hundreds of battles. But I was fighting the contingency throughout and their attack fleets are identical to each other so I feel it was still a decent test.
I decided, hey why not try some destroyers. They are weapon magnets, maybe they'll take the lead in weapon magnetism. And it seemed to make another increase in survivability. I was losing destroyers any time I took any losses, but as yet I haven't had a Titan go down unless all the destroyers were already wiped out.