Who determined the canon is fixed? Where does it say revelation ceased?
There have been men and councils throughout history who have acted as if they ascended to the level of Absolute Being when deciding which inspired books to place within their respectice Canons.
The Muratorian fragment (180 A.D.) and Clermont List (300 A.D.) each has books that Protestants, Catholics and Coptics do not consider to be inspired and the oldest Greek Manuscripts (Codex A, S and B (Vaticanus)) each has books that Protestants, Catholics and Coptics do not consider to be inspired scripture.
If none of theses compilations of scripture got it right and this has occurred throughout the second, third, fourth and fifth centuries then what stock can we place now if they weren’t divine enough to ascend to infinite perfection when deciding what books to place within the canon.
Yes, there is inspired scripture , but we can see from these Codices, the List and the Fragment, that there does not appear to be equal inspiration in organizing/compiling scriptures together.