Hinduism absorbed Buddhist doctrines but never the Untouchables

Evidence

It is true that Hinduism can absorb many things. The beef-eating Hinduism (or strictly speaking Brahminism which is the proper name of Hinduism in its earlier stage) absorbed the non-violence theory of Buddhism and became a religion of vegetarianism. But there is one thing which Hinduism has never been able to do—namely to adjust itself to absorb the Untouchables or to remove the bar of untouchability. — Ambedkar, B R, Annihilation of Caste_ The Annotated…, 153

Categorization

• SEED: Possible essay angle: why syncretism stops precisely at caste lines - absorption capacity has strict limits.
• corroborated: 2 independent passages support this claim — Ambedkar, B R, Annihilation of Caste_ The Annotated…, 153