A very good comment, thank you for adding your experience.
Financially moving home makes a lot of sense, if the parents are willing to shoulder the financial burden. Those parents are paying for the food and electricity the children are using. They are paying an opportunity cost on that room the children are using (they could have used it for their own purposes or even rented it out).
Granted, there is a certain economy of scale in living together, but you can get a similar effect by taking in roommates (I did that for part of college). If the parents were to insist on the children paying close to fair market value for that food, electricity, and rent then the kids would get some benefit, but it would be nowhere close the huge difference you are talking about.
Financially moving home makes a lot of sense, if the parents are willing to shoulder the financial burden. Those parents are paying for the food and electricity the children are using. They are paying an opportunity cost on that room the children are using (they could have used it for their own purposes or even rented it out).
Granted, there is a certain economy of scale in living together, but you can get a similar effect by taking in roommates (I did that for part of college). If the parents were to insist on the children paying close to fair market value for that food, electricity, and rent then the kids would get some benefit, but it would be nowhere close the huge difference you are talking about.
[edited for spelling and grammar]