“every Jew must have some familiarity with the reality of the spiritual world in order for him to properly fulfill the Nigla/revealed part of the Torah”
Spiritual concepts that are in Tanach, Mishnayos and Gemara are part of the Nigla.
However, there needs to be a sequence to learning.
Chapter 11 of Sanhedrin should not be the first Torah someone learns.
There are strong reasons 8 Masechta’s (Tractates) are focused upon in the Yeshivish world. Berachos is not one of then.