The scenario I picture is this:
I would have big bays within a huge carrier ship (or station), closed with such Blast-Doors, in which I would store my own ships. When I want to deploy one of those ships, I undock it from the carrier and open the blast doors for it to leave.
If this works, I assume that it would also be possible to place a door in front of a hangar and open it when I want to deploy fighters.
(yes, this tends to be an aesthetic feature)
I do agree that there is probably some technical difficulty but I am not sure it would be very hard to the dev team. If we take turrets as an example, it seems to me a much more complex feature that works very well.