Well I def shouldn't be an NF then going by this.
I believe being sheltered is a thing. I just don't think I turned out much more mature than a sheltered EII. I think the whole infantile ego thing is probably more subconscious than based off environmental circumstances. Like I think anybody would be more mature than anybody who was sheltered, but as far as adulting I still feel unskilled compared to other people, even without being pampered my whole life.