The reason I say this is that when your fleet gets larger it can be somewhat difficult to keep them in a nice orderly fashion like when you hyperspace to the next mission, or when you first appear at the start of the missions. Of course you can re-dock fighters and corvettes and they repair up and come back out in a nice neat orderly line. However anything larger then a corvette you are reduced to attempting to use the “not really working formations” to keep them together so they don’t get mixed up with other groups.
So if Gearbox made it so that all ships, including frigates, carriers, destroyers, and cruisers could re-dock so they could be repaired and come back out in a nice neat line, it would solve the problem. They could even make it so they don’t repair if they think that would unbalance the game but with formations working terrible like they do currently this would at the very least keep fleets in a better more orderly fashion.
Now I do realize it would take forever to dock the larger ships one by one but the mechanics are already there to do this because when I capture a destroyer, or cruiser, or I retire any ship larger then a corvette they go back into the mothership so obviously the mechanics are already in place and all they would need to do is allow larger ships to have a dock command.