I can just about see the point of the above with the addition of aft, mid ships and forward.
The level of category's on some ships is now eye wateringly long with additional sub groups for locations and then the sofa / no sofa sets etc.
If people are booking select then they just pick the one they want anyway. If saver then there is seldom any correlation between to the cabin "grade" booked and where you end up.
I also feel that these categories have mucked about with "upgrades" on the rare occasion that they are available or gifted by the fairy. Again I am perhaps old fashioned but an upgrade to me is out of a balcony and into a deluxe or out of a mini suite into a suite. What it is not is a move to the same cabin 3 doors down thus moving from "midships forward" to the lofty heights of midships.
It must be particulalry annoying for new cruisers who don't understand that by leaving the upgrade option on they could lose their carefully selected cabin and be "upgraded" to one next to a lift, under the buffet or above the disco.