I deal with a lot of 18-19 year olds as my primary job is teaching first year engineering students.
I will tell you it is a LOT more complicated than this. This type of single point simplification and pronouncement about 'coddling' is decidedly unhelpful.
For starters, if you grow up in two working parent household, both parents can easily come home completely exhausted and unable to provide the extended engagement necessary to help a child develop. Add in the social pressures of school where EVERYONE has an iphone and games where it is socially isolating not to do these things - which carries its own set of risks. Add in a public education system that doesn't focus on development and instead focuses on learning material. Add in an economy designed to optimize extraction of capital from individuals through psychological programming and ads and more stuff to buy.
None of this has to have a single source of blame, much of its realistically structural and cultural. It isn't one bad actor or one failed thing...it is a large number of individuals, groups, and organizations individually performing Goodhart's law and the result is some get cast aside.