I don't have a dog in this disagreement, but putting the bar at "dig up the personal details of 10 different individual people and the changing dynamics of their lives over decades _starting from 1880_" is a pretty insane ask I'd imagine. How many resources for reliable and accurate longitudinal case studies from the 19th century are there really? I suppose we could read a couple dozen books written around then but that's just making a satisfactory reply so prohibitively time intensive as to be impossible.