What does engels mean when he writes "everything which here arouses horror and indignation is of recent origin, belongs to the industrial epoch"?

If the ussrs economy has remained agricultural-based rather than industrial, then a. the unemployment rate among men would have been much lower b. women would have been less in demand in the workforce c. crop productivity would have led to larger , better nourished populations d. children would not have had to leave school early to work in factories