Trees adversely respond to poor pruning practices.
As for the commercial boys and their radial buzz saws, they have no clue what kind of money that technique is costing them. Commercial growers are always looking for the quick and easy, preferably mechanized method of performing the necessary tasks. Trees were routinely retired at the 25 to 35 year old mark. Then I visited the old boy who was famous for being picky about who did his pruning, and I looked at his trees. They were pruned like shade trees, with central leaders and proper cuts.