Why do parents of recent generations give their kids more power than parents of previous generations?

Like, parents nowadays seem to allow their kids more negotiation power than parents did a few decades ago, and seem to worry more that their kids may not like them anymore if they are too authoritarian. Why did parents of earlier generations have better self-esteem than parents of nowadays in that regard?

Why do parents of recent generations give their kids more power than parents of previous generations?
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