i still say i enjoyed the civil/federal economy/ship split from Distant Worlds: Universe. gawd what i wouldnt give for an updated version of that game.
heck sometimes i even just automated the empire and RPed myself as one of my little space captains, and rose through the levels getting bigger/better ships until i had a fleet
or did the same but as a pirate, and razed the galaxy like space Mongols >
but on a more related note, i just dont see the benefit of "civil" ships in the way paradox makes their games, just feels like it will be more micromanagement thats really just more expenses because at the end of the day actually keeping up with it is too much of a pain in the butt, and the half of it you have to hand over to sector AI or what have you will ruin the half you still control anyways