Yongle Grand Ceremony is indeed a face-saving project, but it is all-encompassing, with few taboos. Only the historical materials of Hongwu and Wen Jian Dynasties have been tampered with, hardly damaging the traditional cultural classics of China.
Many ancient books preserved in the Ming Dynasty have been lost today, and they have been indirectly preserved through this Yongle Grand Ceremony. Later, the Qing government allowed the Boxer Rebellion to enter Beijing, which led to the burning of the Yongle Grand Ceremony in the Hanlin Academy, and later lost a lot.
Mr. Yang Jialuo from Taipei World Bookstore can also collect and borrow a whole thousand copies of materials. Unfortunately, this 1000 volume is only about one third of the whole book.