Nice find! I have always wondered why you don’t see soccer played in bare feet more often. I would think it would be ideal, as barefooters are light on their feet and can move quicker than people weighed down by clumbsy shoes
After all, shoes are a technical device like skis or fins, maybe they do give some special advantage to the wearer (if she knows how to use them). Remember the elaborate swimsuits which were eventually banned from competitive swimming?