Such shoes could be used as a means of human powered transport. But probably fashion is more important to people. No one would like to be associated with lazy-s

Such shoes could be used as a means of human powered transport. But probably fashion is more important to people. No one would like to be associated with lazy-shoes - especially people that run regularly enough to think about buying special shoes. At least it is not on the same level as Segway. I used to bike to work, but after hours of sitting I was not happy to sit on even smaller seat. I was afraid of getting hemorrhoids. Because my butt hurt. Now I usually use kick-scooter and in case of my commute it is a bit faster, because I don't have to take time to lock a bike. I just fold the scooter and take it with me. Also I don't put more pressure on my butt. Other means of human powered transport without butt pressuring: running (and then that shoes could help), roller-blading and skateboarding.