Each child is different, yes. But your average kid needs some space to themselves. They have to find new and interesting ways to screw up. And they have to be able to do this without being supervised 100% of the time. If you want them to be responsible for themselves when they become advlts, you are going to have to allow them to be responsible for themselves occasionally while they are kids. Sure they need supervision and a lot of it, but too much supervision can be just as bad as too little. The way things are now if a kid isn't with his parents even when he is asleep, Child Protective Services is going to get a call. It is really surprising that they don't get a call when some parent leaves a kid in the custody of some stranger called a teacher.
Kids are free thinkers. By their nature they think outside the box. They are constantly adding two and two, and seldom tell you when they are doing it. Kids know that there is a reason for everything. They may not know the reason, but they do know there is one. Mommy washes the dishes when I am playing in my room. There is a reason for that. Mommy never washes the dishes when I am playing outside, she is watching me. There is a reason for that. Daddy washes the clothes when I am in my room. There is a reason for that. Daddy never washes the cloths when I am playing outside. he is watching me. There is a reason for that.
I am not allowed to walk to my friend's house five doors down the street unless Mommy or Daddy are with me. There is a reason for that.
Look, just because the entire advlt population of the world is neurotic, doesn't mean we need to make the kids that way, too. Let them have a normal childhood and wait until they are advlts before they have to become neurotic.