Anyway the point - from Mark Young - is that heavy squatting can cause problems to the back. It reminded me of the point Matt made a while ago:
I see this differential in my toddler as well. Toddlers squat constantly, but it is all "mobility" work. The squats are done for the purposes of movement, not for the purposes of lifting a weight. If a toddler wants to lift a weight, they shift into a deadlift position.
It's probably been about a year since I've done weighted squats. At this point, I have no desire to go back to them. I am content training the deadlift as the main lift. I know squats have been utilized in weight programs for decades, but that doesn't mean that they are necessarily 100% healthy.
Mike Boyle raised some controversial points about squats last year: