Let's look at some of the explanations: Freud and psychoanalysis
Freud really said very little about subpersonalities. It is true he did talk about the blind, energetic, pleasure-seeking id; the priggish and punitive superego; the ego, battling for its being by diverting the energy of others to its own use. The drama of the way in which these three characters interact has an economy and
a terseness. The ego develops defence mechanisms for dealing with the threat of id impulses; repression, rationalization, denial, projection, and the rest. Balances are struck between the actors, and in the balance is character and neurosis. But Freud himself never said much about how to use all this actually in the therapy session, and his followers have mostly followed suit.