But what you mentioned is interesting. Look at heirs of great fortunes. They either find something productive to do with their lives, or they stay basically children their whole lives and that often means trouble for them (not always though).
My wife certainly has a more independent personality than I do. I put more faith in her ability to recover if I got hit by a bus than I put in my own ability, were the situation reversed. People like her make me believe that there's a difference between "dependent by circumstance" and "dependent by nature", and experience tells me that neither of those are static qualities. Circumstances shift, and someone may grow or regress according to their environment and personality.