That was a long long long time ago, and people do not pay for history.
Staterooms are priced on " value" and " perceived value", people pay for benefits.
It is accepted a verandah room is better than an ocean view, is better than an inside room.
If on release day all the prices were exactly the same, people wouldn't book deck2, they would book higher decks. Everyone knows the benefits, " today" and not based on cruising in history.
Deck2 is closer to:- engines, the sea, the waves, the vibration, and is enclosed, therefore as science dictates, the closer you are to something, the more effect you get, and science covers the further you are away, the least effect you get.