You and I are around different people! Yes, that pile of rocks isn't too big of a deal for young and agile people, but try to imagine the 10th percentile of people walking over that. Older, not as fit. That rock pile would be a struggle.
I don't disagree that it's still far away from a human in good shape, but there are certainly a significant percentage of people who wouldn't be able to walk over that, or would slip a few times while doing it.
That sort of terrain is also no joke if you have to traverse it for large stretches, even for athletic people. It's very similar to mildly rough mountaineering areas and that will wear you down quickly!
I don't disagree that it's still far away from a human in good shape, but there are certainly a significant percentage of people who wouldn't be able to walk over that, or would slip a few times while doing it.
That sort of terrain is also no joke if you have to traverse it for large stretches, even for athletic people. It's very similar to mildly rough mountaineering areas and that will wear you down quickly!