The prayaschitta compromise preserves caste indefinitely by smothering reflective thought.

Evidence

By this theory of prayaschitta, the shastras, by following a spirit of compromise, have given caste a perpetual lease on life, and have smothered the reflective thought which would have otherwise led to the destruction of the notion of caste. — Ambedkar, B R, Annihilation of Caste_ The Annotated…, 986