You suggest I use an all (or mostly) warship fleet? I do not think it is a good idea.
When I tried all warships against Ordos, it died or took too many casualties. Too often, my warships could not shoot at the enemy because allies were in each others' line of fire. Well, five Paragon fleet can win, but not before losing one or two. (I take less or no casualties with a more balanced fleet. Fewer frontline units supported by Dooms and fighters seem more effective, but not as much as Spark Drover cheese that chugs my computer.)
The phase ships seem like much, but they are mostly Afflictors to be chain-deployed and I pilot those (because four Reaper cheese twice per ship is so brutally unfair and effective) while my default flagship becomes yet another AI grunt. If we still had synergy Harbinger, I would bring only one or two of those instead of about five Afflictors. (I would bring even more Afflictors if not for fleet cap.) Endgame, I can use Afflictors as suicide bombers (decloak in a crossfire or within target's blast range if it means the Reapers land). I bring two or three Doom because they are generally great and AI uses them well. Generally because they do not always play nice with burn drive ships.
Early game, I make do with what I find (which often means clunkers and lots of (D) mods). Aside from starter ships, that usually means low-tech, aside from Shrike (P)s, which are good for being cheap and disposable. Later, whatever I get from enemy expeditions. Only late in the game do I get unlimited choice of what I want.
Of conventional high-tech ships...
Frigates... I skip nearly all of them (not just high-tech) very soon after game start. Wolf may be of interest because it is a possible starter and the freebie fleet from the tutorial includes one. For Wolf, I can do something with hard flux loadouts, but it is painful and one mistake means Wolf dies or takes too much damage. AI gets an all-beam loadout, if possible, to harass things for a few fights before they get replaced by destroyer-sized clunkers.
Destroyers... Shrike is cheap and disposable, especially the common Shrike (P), so it is useful enough. Medusa seems okay as a playership, but by the time I can get one, I already need a cruiser or bigger. Medusa used to be very good, but it is not what it used to be. I do not trust AI enough for Medusa, at least if I buy a pristine one instead of swiping a clunker from somewhere.
Cruisers... Apogee does so much for below-average DP cost, and it is a possible starter. Also, for early game, it can rely more on Locusts than energy weapons, if it gets Locusts early. (It can fend off a small frigate mob that an Eagle would struggle with.) Aurora... AI seems to do stupid things with it, which is good when I fight it (it is one of the first to die) or bad in my fleet. If I want AI to use it, it must be Aggressive, which is annoying when everything else I use can use Steady AI. I can make it worth its 30 DP if I pilot it, but it is so much effort and unforgiving of mistakes. I can use a cheaper ship (not as good, but easier to use and keep alive) or a slightly more expensive ship that is much easier to use (no need for finesse when I can overpower them instead).
Capitals... Odyssey seems to work best with an unbalanced loadout. (Unbalanced in the sense of a diet.) If I try a classic loadout that was good before 0.8a, it is sub-par and it dies. But if I do something silly unbalanced like put two plasma cannons, crazy high dissipation, and very little else, it is more-or-less equal to Paragon, but only if I pilot it. If I give it to AI, it acts dumb and dies. If I want a loadout that the AI can use, Odyssey works much like an extra-large Shrike (heavy reliance on kinetic missiles) which while still roughly capital-grade, is nothing exceptional (whether I pilot it or AI). Paragon is good. Great in player hands, but AI does not do much better with it than with Onslaught or Conquest, not enough to make it worth 60 DP.