Originally Posted by
TravlnD
One of the other threads had a photo from Boeing that may have a clue. With the somewhat smaller dimensions the bags can all go in on their side, meaningfully increasing the number of bags that can be stowed.
I guess they need more space since less legroom means more passengers (and bags). Also by charging flyers to check bags, more are being carried on board and need space.
That is a patented design for Boeing aircraft. The overheads need to be changed significantly to make it happen. In the process of finding example dimensions to show how ridiculous this change is vs. actual overhead size.