It would be somewhat simplistic to claim that Tibetan Buddhism was the most advanced form of Buddhism thought solely based on the timing of its transmission and the presence of fully developed Mahayana schools like Yogacara and Madhyamaka. While Tibetan Buddhism indeed benefited from the transmission of these sophisticated philosophical systems, the advancement of Buddhism thought cannot be solely measured by the presence of specific schools or doctrines.
Tibetan Buddhism, also known as Vajrayana Buddhism, developed its own unique characteristics and contributions to Buddhist thought and practice. It integrated elements from Indian Buddhism, including Mahayana philosophy, Tantra, and Yogic practices, with indigenous Tibetan religious traditions and cultural influences. This synthesis resulted in a rich and diverse tradition that encompasses a wide range of philosophical views, meditation techniques, ritual practices, and artistic expressions.
Furthermore, the development of Buddhism thought is not linear or hierarchical, but rather multifaceted and contextual. Different Buddhist traditions and schools emerged and evolved in response to specific historical, cultural, and social contexts. Each tradition made valuable contributions to the overall development of Buddhism, addressing different aspects of human experience and spiritual inquiry.
Therefore, while Tibetan Buddhism certainly inherited and developed sophisticated philosophical systems like Yogacara and Madhyamaka, it would be more accurate to appreciate Tibetan Buddhism for its unique synthesis of various influences and its rich tapestry of teachings and practices, rather than simply labeling it as the most advanced form of Buddhism thought.