IMO, the parents who spend the least amount of time parenting their kids seem to have the most unreasonable expectations of their child's caregivers. I believe the more hours a child spends emotionally detached from their parents (whether in daycare or strapped in some device/glued to some screen while their parent is tuned out) are, and will continue to be, the ones with the most behavioral issues.
I think that has stayed consistent over the years.
Kids have not changed, parents have not changed. Society's expectations of parents have changed. They are no longer viewed as capable of raising children without intervention. That is new. Parents should be offended by the over reach, but I am not seeing that reaction at all. Many seem relieved of duty.