Everyone tends to view history from an angle that supports their preconceptions. You don't seem to be any exception.
> Terrible as the worker conditions might have been at the dawn of the Industrial Age, they were a vast improvement compared to the past.
How are you defining worker conditions?
A family with a small plot in the countryside could not occupy their full time with cultivating the land. If you travel throughout the deep countryside of countries like Cambodia, Vietnam, China and the poorer parts of Thailand like Isaan, you still see much evidence of this today.
People moved to the cities because they could make more money. It's that simple. In no way were working conditions an improvement if you care about hours, health and safety. The ready availability of jobs for unskilled labor also created perverse incentives for parents to send their children to work at the factories. That was true in late 18th and early 19th century Europe, and it is still true today in the poorer emerging economies.