I would worry about that if sharp objects, pointing upward, were often found on the ground. In my experience, such things are rare. I should and do, for safety, look around a bit at where I walk.
When I tried walking barefoot for a summer, the visible glass shards weren’t a very big problem (I never stepped into any of them, though it was annoying having to be on the lookout to avoid them), but I stepped twice into tiny glass shards (few millimeters in length) that were then also subsequently more difficult to remove. They didn’t hurt as much, though.
Another annoying thing was that I always had to wash my feet when I came home.
When I tried walking barefoot for a summer, the visible glass shards weren’t a very big problem (I never stepped into any of them, though it was annoying having to be on the lookout to avoid them), but I stepped twice into tiny glass shards (few millimeters in length) that were then also subsequently more difficult to remove. They didn’t hurt as much, though.
Another annoying thing was that I always had to wash my feet when I came home.