"You're supposed to be barefoot."
That is probably true. But, people who have lived with the benefits of civilization for all of their lives may need some assistance.
I grew up in southern California and went barefoot, mostly, except at school, until I was 12. Then, probably because of social expectations, I started wearing shoes; been wearing them ever since.
I suspect that my feet have adapted quite a bit to shoes over the years. And, I have no interest in going barefoot on the trails.
Furthermore, now that I am in my 70's I plan to use every bit of technology and assistance I can to keep going. If that means arch supports, orthotics, taping or whatever, so be it.
Back in the days when everyone went barefoot, the human lifespan was probably about 35-40 years. Feet evolved to meet that demand. For those of us who are now nearly twice that age, a certain amount of age-related deterioration is to be expected. I have to contend with osteoarthritis in one foot and the after-effects of broken bones in the other foot. I choose my footwear and accessories to deal with these limitations.
So, while in theory, going barefoot may be more natural and better, in practice, it isn't quite that simple.