I have to wonder whether divorced parents are more prone to be lax with the rules because they don't want the children coming to think it's more fun to be with the other parent. Kids play parents off against each other at the best of times and when there's no way for Daddy to verify the claim that "Mummy lets me...." he has to decide whether to risk being too lax and letting the kids outplay him, or being too strict and letting the kids think he's no fun because there are too many rules there.
I also don't think helicopter parents do their kids any favors. They may think they are making sure their offspring gets the best chance but all that style of parenting does is leave the kids utterly unprepared for the first time they have to face a situation on their own. Just like children need to face consequences for bad behavior before it escalates and the police get involved, so they need to learn to fend for themselves sooner or later because Mummy and Daddy can't always be there to answer questions for them if they struggle.
Sometimes I wonder whether the way kids seem to be suffering from ever-rising stress levels is a combination of parents who won't look up from their phones when the kids are wanting attention, and parents who insist on doing everything so the kids never learn to work stuff out for themselves, leaving the kids feeling abandoned in a world they don't know how to interact with.