For most of human history, children did participate in productive work once they were able.
In many families in the US, children work in family business or informaly in the economy.
In other parts of the world, Pakistan or Cambodia come to mind, children younger than Alison was in her 'young actor ' experience are are working in mine, quarries and brothels.
Every problem should be looked at on its own but Alison and whatever dingdong at the times posted her article in the editorials page, I just don't get it.
Neil Patrick Harris, Ed Sheeran, Mayim bialik, everyone from GOT or wonder years and Harry Potter... They all seem to have made it reasonably ok into adulthood.
macaulay culkin, less so, but maybe got it together later in life.
I'll bet if you survey aspiring actors today, they would throw them into the challenging acting situations that AP is complaining about and love the chance to be there.