I love the Edge class public spaces and the Retreat Space, but I am NOT in favor of the IV. I think it was a HUGE gamble ordering 5 ships with something the public might not take to. I haven't heard as much negative as I used to, but I certainly am not hearing "I wouldn't want to sail in any other type of stateroom" either.
With the pandemic, you think they would have pulled the plug on at least the Ascent and the 5th one until they found out the reaction to Edge, Apex, and Beyond. And now a 5th when they are bleeding cash? That does not sound like a good business practice to me. I am sure there would have been penalties, but they wouldn't have been in the billions.