There are six traditionally given reasons for claiming the importance of Chapter 16. These six are: 1. The revelation of the eternity of the Buddha, 2. It shows misguided people the way to Buddhahood, 3. Revelation of the eternal Buddha Land, 4. Eternal salvation of the people, 5. Actual salvation of misguided people, and 6. The vow of the Buddha.
Lecture on the Lotus Sutra