spar, my theory is that people take their movement patterns from everyday life into the gym. Most people spend most of their day seated. That is, they spend all day with their hips flexed, and when they need to bend over to pick something up, with hips already flexed they have no choice but to flex their spines, ie bend their lower back.
Come into the gym, and what do we find, when they deadlift they avoid flexing their hips and just bend their lower backs.
Because my gym lacks bumper plates, and 60kg is more than most people can start with, I've had to start people in the rack - the bar sits just below their knees, about 5" above where it'd be normally. Most people can start with 40kg, I have them work up to 70-75kg in the rack, and then they can do 60kg from the floor; the 5" extra range of motion seems to be equivalent to 10-15kg of weight.
Perhaps it's the shorter range of motion being not so demanding on their bodily awareness, perhaps it's giving them time to improve joint mobility, etc - I don't know really - but I've found greater success in beginning with rack pulls and working up to deadlifts than when I was in a gym with bumper plates and we just went straight to deadlifts.
Because I often see restrictions in dorsiflexion, lots of knee issues and so on, I've actually been able to get more people doing deadlifts than I've been able to get doing squats.
Just my experience, for what it's worth.

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