How perfect is Voynichese?

[ololololo]

I think, we just don't know if the author was a genius or a dunce or anything in between.

Anyway, his knowledge of medicine was impressive, which means he was hardly a dunce.

What's wrong with Codex Copiale?

This is not an example of a "corrupted" cipher, but it seemed to me that this is a good example of a cipher with additions (in the case of Copiale substitution + nulls).