Even though the study of Musar [mediaeval books on ethics] was emphasized by Israel Salanter as away to gain correction of faulty character traits, it has the further advantage of world view-- that is of gaining a world view not contaminated by modern confusions.
To some degree the effect of modern confusions can be mitigated [lessened] by the study of midrash, still midrash is not systematized. Musar is systematic and does not depend on philosophical sophistication or previous knowledge of tenach or gemara.
There is also advantage that pseudo Torah is generally taught instead of Torah. musar shields from the Torah of the Sitra Achra [Dark Side Torah.]]
