You're using the wrong reference group here. Would you still assert that most people when narrowed down to those who are running every day are more at risk from a lack of sufficient physical activity than from overtraining? Because that's the group we are discussing – those either doing it or considering doing it.
Most of the adult population in first-world countries are not considering running every day.
Saying we need to do more physical activity is not carte blanche to run yourself into the ground. No decent running coach would recommend running every day anyway. 3-4 times a week, and then let your body rest and recover. Training does not make you healthy or stronger. Recovering from the training makes you healthy and stronger.
Source: was fat, ran a lot, lost weight, got runner's knee, am fat again.
I've never done the like barefoot-barefoot thing but switched to minimalist zero-drop shoes.
It was in fact a game-changer for me, all of a sudden in my 30s I could run 10k without IT band pain (even when fairly athletic playing American football in my youth). But when I pushed more into the 10-mile range I got runner's knee - diagnosed w/o MRI or anything as patellar tendinitis although I'm sort of worried it was actually my meniscus.
I kept wanting to get back to it and kept re-aggravating. So I have now mostly given it up for like a year. Bad for my health of course. But as I move forward forced days off (ideally cross-training w/ swimming, kayaking, hitting a heavy bag, etc) just have to be part of the plan.
Maybe 10 miles is too much regardless though.
But I'm not that skinny since "long time". Running 2-3x a week.