Originally Posted by B_Duck
please refrain from stupid answers.
What they're telling you in their own 'clever' way is that these questions don't have good answers.
Well, maybe the first one... SN and MN were added afterwards, they were not original NF navies. Ergo, their harbours are still not enabled for fleetish stuff.
Things like letting you store a premium ship in the HQ... there's no real advantage to this, unless satisfying your OCD is an advantage. It's not taking up another ship's space, HQ space is limited, and lots of stuff is legitimately not working right that should get fixed before they start doing cosmetic stuff.