The Winnipesaukee Pier, there, was built in 1925 so there's been an open and unobstructed view from the bottom of Simpson Ave, two waterfront homes going back to1925.
A floating restaurant with a structure, size 24' x 64' x 20', is much more a building than a boat. It looks and operates like a commercial building when it is tied up to the dock there, so does it get away with obstructing a view that's been unobstructed since 1925 because it supposedly is a boat, which it is not.
If you ever watch it try to negotiate the waves and wind you will see it is not see much of a boat. It is a floating building that can slowly negotiate calm waters with little wind present.
If it were moved way to the right, for docking, in the spot formerly occupied by the 48' sailboat, Winnipesaukee Queen, close to the bow of the Mount Washington ..... it would be close to other cruise boats and not blocking any residential homes. Seems like a smooth move, to here, there, here, there! ...
The rules for mooring boats are based on the operation of a boat, and a floating building is not a boat, it is used as a building when it is tied to a dock for public use.