There’s another study out on what most shoes do to feet, and specifically the stress that gets transmitted to the knees. Najia Shakoor, who’s been the lead investigator on other similar studies, Walking barefoot decreases loading on the lower extremity joints in knee osteoarthritis, and Effects of common footwear on joint loading in osteoarthritis of the knee, is also the lead investigator on this one.
It shows that training in what they call “mobility shoes” (designed to mimic barefoot walking) can lessen the stress on the knees even when regular shoes are then worn.