I resolved my plantar fasciitis by switching from hiking boots to thin soled trail runners. My theory is that it makes me take more care in putting my feet down, and makes me stretch them considerably more as they conform to rocks and holes. I was just stomping over everything in the boots.
I read someone who said that walking barefoot was a religious experience for them, in which every step was a prayer. Someone responded that they weren't as religious, and for them every step was fondling the earth. Both work for me, and both work better with thinner soles.
I've spent quite a bit of time in outdoor sports and don't think I've met a single person who did a lot of rough hiking and preferred heavy duty hiking boots over lighter trail running or approach shoes. I see quite a few of the old school heavy boots for sale in some stores so there must be a market but I have no idea what it is.
Barefoot hiking is also very niche from what I've seen, but I do think there is something undeniably nice about walking around camp or a yard in bare feet.