All were either proven true prophets or apostles in the original sense. You need to point to their false prophecies for one - secondly - i see no indication Smith is either a restored prophet, or a re-continuation of the apostolic line you claim ceased with the death of Christs immediate apostles.
To the contrary with Mormonism, we see Smith elevating himself above the apostles and above the Church
I'll spare you the direct quote for brevity
Im with you on the Nicene being thought of as "scriptural" or leastways elevated on the same par......I see it instead as a tool of man to define the understanding of the Godhead...based in Scripture...
You say that the writers of the Bible were “proven” true prophets. How were they “proven” true prophets? Was it some undeniable scientific test or is it still a matter of faith?