That reminds me of story where the US Air Force attempted to design a cheaper cockpit and chair that would fit the "average pilot".. but in practice it fit nobody well. They went back to the drawing-board and put in all sorts of adjustable components instead.

This is likely because the individual measures being averaged like "femur length" were not independent from one-another, even where they had the benefit of being normally distributed.

The specific quote that we are talking about reads like something I wouldn't find unusual in the works of an individual. Maybe not from someone who stands out as someone who writes things that you'd actually want to read, but from an average Joe? It is likely. I, being no wordsmith myself, have written things just like that. It looks quite typical of how people write to me.

In fact, I find no meaningful difference between "But no _individual_ speaks like this." and "But the ratio was never the danger.", aside from them being about different topics. They are syntactically very similar.