30 seconds in barefoot shoes convinces you that you must change your form. But 30 years with your feet in what are pretty much casts, leave you very prone to tendonitis, stress fractures, etc. if you try to cover any distance in them. People that go barefoot for 20 years have strong feet. Most of us have weak, nasty, under-developed wussy feet.
They should not have made strong claims when there was no scientific evidence, though.
Actually there is plenty of scientific evidence. You just said it. Spend years running barefoot and your feet/ankles will strengthen. They just failed to mention that it takes years to do it.
