[safety1st]

I am not clear on what conclusions we are discussing exactly.

* 20kg-30kg makes sense for an untrained person's first lift, it sounds like we agree. With DL you need some plates on the bar to get the right height so 5kg bumper plates or something is common.

* All of this is still way below the numbers even for beginners on the site you linked, which again I stress, is a self-selected group of people who were hardcore enough to opt into a performance tracking app of some kind, this is way different from the general population.

* I actually don't agree that the vast majority of people could just bust out, let's say, 10 reps at 30kg of any lift. Women and older men who have never lifted? I really doubt it. A year ago it was hard for me to do 10 body weight squats, no bar no nothing, and most of my middle aged friends who have never exercised are probably still in the same boat. 40% of the US is obese... I think this perspective is biased basically towards young men (lets say under 40).