>>2690537Tribalistic peoples like the Native Indians and Gypsys would travel long distances and be constantly moving all the time. Yes their longevity wasn't as long as ours due to lack of knowledge, but if you couple our modern information with our God given physical ability you can make it work today as well. Theres still some situations I'd prefer boots but that doesn't mean it's impossible to go barefoot in those scenarios, they just require training.
>>2690540I'm only citing some examples, but if you want my personal experience I've been walking barefoot since I was a kid (5-6, excluding time off through high school). My feet were tougher then everyone I knew, I could run and jump on rocks and withstand harsher degrees of temperature. Granted yes, I did get an occasional injury but they healed great and would often make my feet even stronger. Improvement to proprioception (when I started walking in shoes I lost an edge on coordination), greater balance, engagement of all the foot muscles including toes to center yourself, improved coordination, far more adaptable (never had issues with rolling my ankles or injuries while a lot of my friends did).
I didn't go barefoot throughout all of my teen years and I regret it, now I'm mid 20's and working to get that strength back and it's great, theres also an intuitive sense of the ground beneath my feet I completely forgot about until going barefoot again (Like memories stored in certain sensations, and an improved ability to gauge the terrain).
Yes, shoes or boots may be great for extreme environments/duration of your engagement to said environment, but with a tough enough foot you can even manage them up to certain point.
I'll trust millions of years of human development and God given ability over whatever "Foot doctor" yuppie science has to say, I've done it and it works for me, so I'll swear by it.
>Pic Related is Chinese foot binding, humans often do all sorts of things to conform themselves to standard. 
