Why is the problem of upbringing relevant today?

1.there is a need to look for an individual approach to each child, which is not described in textbooks on correct upbringing, which is why there may be certain disadvantages in raising a child, such as a depreciation of experience / lack of attention
2.Many parents still do not take a responsible approach to childbirth, for example, transfer their many years of experience to inexperienced children, do not consider it necessary to explain what is good and what is not, because of the confidence that children will understand it themselves