My daughter had a pair when she was 6. By the time she outgrew them a year later there was definite wearing in the soles, mostly sloping at the edges.
Edit: Actually she was wearing Natives. They seem almost identical to these Saguaros, I’m not sure which came first.
Edit edit: And the internet really isn’t helping me. I can’t find a single article that mentions both Native and Saguaro shoes, let alone compares them.