I disagree with you Sir Aiden. There is currently a resurgence in minimalist footwear for modern use. I'm a believer through years of experience.
I wear five-finger shoes to run on the hard street with and do all of my physical training with, and have for 3 years now. The problem is that modern shoes with all their cushioning encourage you to land on your heel, which physiologically is not how you are supposed to land while running. Your heel is not a shock absorber. So we cushion them up on modern shoes. It's a self-perpetuating problem.
When you run barefoot, or in five-fingers, you're forced to run like you're supposed to run. That is, being a forefoot striker. If you land on the ball of your foot, like you naturally do while sprinting anyway, the action of the foot landing on the ball, collapsing back to the heel, and then re-propelling off the forefoot is what your body was designed to do in order to absorb the shock of running.
I used to have knee problems, when I started running on hard surfaces with NO protection except for the minimal sole on five-fingers, and forced myself to re-learn how to run properly, all my knee problems went away.
All the stabilizing muscles in my ankles and mid foot that had been atrophied from the use of modern supportive footwear, re-strengthened on their own as they were intended to be used.
Medieval footwear replicates this experience.
The reason modern folks discount the use of medieval footwear has little to do with protection, but a lot to do with the poor mass production techniques used that give rise to the false belief that medieval footwear is slippery. This is entirely false. That's why people shouldn't knock 'em til they try 'em. Mass produced medieval garbage does NOT equal real medieval footwear.
In fact, part of the reason I made these was because I always suspected that authentic medieval footwear would be very similar to the modern minimalist approach. I was very happy to confirm my suspicions.
The only thing I will concede is that authentic medieval footwear WILL wear out prematurely on pavement because of the leather soles getting chewed up. But those can easily be replaced, as the upper will remain intact.