Here follows Or Yaqar Tikkunei HaZohar vol. 1 p. 135 last paragraph:
"All the work that is done in comprehending and applying the teachings of the Oral Torah is deeply involved with the secrets of Metatron.
"And one who begins this work will initially acquire many interpretative difficulties to their theoretical framework. This will bring the student into the secret of the exile in the depths of the Klippot, wether they know it or not.
"And the reason that there are no major disputations or interpretative difficulties except the ones that came from the students of Hillel and Shammai is due to their scattering into obscurity after the destruction of the temple. And for the purpose of understanding the secrets of exile and redemption, the scholars of the Oral Torah immersed themselves in many of these interpretative difficulties and tried to clarify them for future generations of Torah scholars."