The learner’s background matters

Badihi and Nazari Forms of Conception and Judgment

For a beginner, the grammatical concept of mabni may require definition. After study, the same learner may recognize it immediately.
This does not abolish the textbook's distinction; it reminds us that the need for explanation can depend on the learner's familiarity.
In teaching, ask whether this audience already understands the intended meaning or still needs it explained.