This you don't see much in Musar. Musar today has de-evolved into simply psychology.
And Psycholgy has no coherent theory of the human being. It has one school in which man is simply matter --Skinner. Another school which is just the opposite.
The Litvak approach is in essence a straightforward attempt to get back to classical Torah of Talmud and the medieval Jewish thinkers. This is admirable. And it has an important ethical backbone. And that ethical part of it is important because devekut is impossible without ethics.
However there are flaws in Medieval system. These flaws were there in the first place and creating a pseudo Middle Ages --i.e. a movement to supposedly return to that type of mentality does not work.
And it weakness is already apparent by the fact that Nietzsche has already conquered "chareidic" Judaism (by way of his messengers Weber and Freud.). You can't have a conversation with a charidi without Nietzschiean concepts --commitments, life-goals life-style, values, self esteem taking over.
I was having a conversation with one chasid who had never even heard of Nietzsche and had learned in Satmer his entire life and he was trying to prove to me that the Rambam hold lack of self esteem is the source of sin--not pride. You see from this that chasidic thought has been emptied out and replaced by Nietzsche thought.