Doctrines & Covenants - not found in the Bible; are THEY important?
The bible is important because it documents the word of God and his dealings with man.
I seriously doubt Neoplatonic realism stems from God.
[If true] then the Doctrines & Covenants also documents the word of God and his dealings with man, just much more recently.
Its easy to see the importance.
Mormons do not call other Christians non-Cristians if the do not believe in the D&C. Understand the difference?