Ever been on a Fleming?
Walk-around deck and a main cabin you could hold a dance in.
This eliminate-the side-decks-to-get-a wider-cabin is in my observation kind of bogus I think. It's sort of like Airbus saying their A330 cabin is five inches wider (or whatever it is) than the Boeing 767 cabin. Technically, Airbus is correct. But from a practical standpoint, in the words of the former CEO of Continental, "Nobody really cares."
Now if we held dances in our main cabin it would probably make a difference. But we don't. We sit, we play cards, we eat, we look at the stuff around us. If we widened the cabin by the amount of the side decks we'd still sit, play cards, eat, and look at the stuff around us. The only difference is there would be a few more feet of empty space between us the person across from us.
Not saying if we had the space we wouldn't like having it. But we wouldn't like having it enough to persuade us to give up the walkaround deck.
So our solution if we
really wanted more width in the cabins would be to get a larger boat. A GB42 instead of a GB36, for example. Or a Fleming. Then we could hold a dance and still have a full walkaround deck.