I don't see how hard it is to imagine that in a universe where there are literal energy shields that can absorb and block all incoming energy by consuming from some other source of energy there couldn't be a directed beam from a third party that if tuned correctly (hence the need for a wing) could impart more energy to reconstruct said shield. It's not "healing" the ship, it's just recharging the shields in the same way a SCB can dump extra energy into a shield to recharge it. No shields and it's useless. Not in a wing, it's useless. Concentrating on aiming at a wing member, you're not able to attack anyone else. Get your fire groups confused, you've just attacked your wing mate.
This is a Wings-only mechanic? Has there been any thought given to player who don't want to wing up? (e.g. npc wingmen)
Regards.