I raise map size because I want to use a fleet in a game that wants to be a fleet game. Instead, with 300 map size, I am stuck with two or three capitals, and I slog through multi-round combat because AI cowers too much (or has too many big ships that slowly trickle in) and fights drag on for too long. They are not fun. What is the point of a fleet if I can only deploy few ships? 500 map size fights finish faster.
In earlier releases, 500 map size was enough to fit everything on both sides in. Not today.
If I want a fleet battle, I want all ships to fight. I do not want Star Control SuperMelee. I might as well play Ur-Quan Masters if I want to play that kind of game.
I want something that can take out those cowardly enemy small ships. It can be frigates or it can be anything else with speed. If I do not have ships that can take out fast cowards, then the fight drags out until the enemy gets cornered or runs out of PPT and flames out. I only use frigates if that is all that I have (early game) or if they are overpowered (Afflictor). Frigates (and most destroyers) are generally too fragile, have too short PPT, and clog fleet slots better used by more powerful ship.
I do not use carriers that are not Astral as strike, unless I have no other choice. Earlier in the game, I will use bombers on smaller carriers to chew through battlestations (I probably do not have Afflictor yet). By late game, once I have Astral and/or several Afflictor, they are sufficient for all of my strike needs. Other carriers I bring - Drover, Heron, Mora - generally have interceptors to pick off small fry or help distract other enemies.
I tried Spark Drover spam. While very effective, it kills the frame rate on my computer. I do not want to use fleets that do not play nice with my hardware.