The issue with the hanger is not really performance, although I would detail box it. The issue lies in compatibility and the damage lightning issue, and the fact if someone DOES make a mission utilizing the hangar, they would have to assure that everyone playing their mission is using the mvp's, possibly even requiring the MVadv to be running. The mission would utterly break for a person who cannot run the new Hatty.
Although I will humor that it is up to the FREDder to tell people they need the HTL Hats.
Okay, everyone, what will it be? No hangar, or hangar?
(BTW, the following are slated for detail boxing: Hangar (should it stay), thrusters, docking point)