Blind lobbies would also make it MUCH harder to teach newer players. Whenever I see a novice pilot in ANY captain slot, I try to let them know if there's anything they could be doing better. Also, what they did well, but that's not as important here. Being able to wave people away from builds, like the double flak Pyra, is useful. It gets us both a better match, while also allowing me to see who communicates with me, and if there's anyone who might be worth Ducking. The only way to set up this thought experiment in a way where I don't reveal the other team, and of course my own ship, is if I know the other captains, their crews, and what they'll bring before hand. If that's the case, they probably would have a good idea of what I would be doing as well. In this scenario "Counter-Play" is still very much a thing. There's simply a layer of bluffing added on top of it.
For example, me: " I know you're going to bring a Mobula even though this is Paritan, So I'm going to bring a Blenderfish." other guy: "You'll probably bring a Blender to counter my Mob.. so I'm going to bring a Brawl Galleon (or whatever)."
This is something that I'd really rather avoid in GOIO. I understand that having the other team bring ships/loadouts to try to counter yours can be stressful, but it's a lot better than this alternative.