The economic advantage of dwarf trees is not based on more bins per acre once trees are in production. It is during the years freestanding trees are not in production that the advantage occurs. This is speaking generally- soils that encourage excessive vigor may benefit from dwarfing rootstock throughout the existence of an orchard.
I have read about Japanese orchards on seedling rootstock that got extremely high yields of highest quality fruit, but the labor involved is much greater than with dwarf trees. Spraying and harvesting are harder and pruning is much, much more labor and skill intensive.
Where free standing trees pruned low would be an advantage, I think, is in pick your own operations. The ignorant hordes would likely do a lot of damage to dwarf trees while ripping off fruit.