Quid est veritas? The Church teaches and Catholics believe that Scripture is a significant part of the Revealed Word but is not 100% of the Revealed Word. No amount of arguing in this forum is going to change Catholic teaching or any educated Catholic's beliefs. I do not hope to change your views either.
Jesus spent three years preparing the 12 Apostles for their ministry. During that time he gave no written assignments or notes. Jesus wrote nothing down. The only reference to him writing anything was in the sand. Jesus then commanded the Apostles to go and preach the Word. He did not give them a book, training materials or written instructions. They took with them the Tradition. It was entirely oral and remained so for the hundreds of years it took to produce the Bible.
Even after the Bible was created there were hundreds of years in which there were very few capable of actually reading it so Christianity remained a Traditional faith.
There are hundreds of versions of the bible and many thousands of interpretations of the so-called simple, plain, clear, self-explanitory and self-interpreting writings. In this context you would have me accept that the millions of interpreters. You can keep the all of that with the added complexity of the many millions of farm hands and milk maids all clammering about what it the Truth. I am content with my Bible, my Church and the Magisterium.
I was born, but not yesterday! Have you forgotten that Jesus DID tell the disciples that the Holy Spirit would come to them and would "bring back to your remembrance all the things I have taught you"? Do you think that the Apostles just might have realized that Jesus was not coming back in their shortening lifetimes and that they need to write down what he taught? Have you forgotten that Matthew, Mark, Luke, John, Peter, Paul, James and Jude wrote down the additional revelation given to them by the Holy Spirit so that these truths could be disseminated throughout the Christian world? Now who do you think gave them the idea to do that?
Your contention that "It was entirely oral and remained so for the hundreds of years it took to produce the Bible" is patently FALSE and I am kinda surprised you said that. An "educated" Catholic would certainly, or SHOULD certainly, know that as the epistles were written they were copied and sent out. Just because there was not a "formal" collection of these books called THE BIBLE, doesn't mean they were not accorded the same exact respect and obedience afforded to "oral" teachings from these same leaders of the early church.
I have no illusions of "changing" your mind, but I will stand up for the truth of the Gospel and the authority of the Holy Scriptures regardless. There are souls you nor I may never know about who are won to the Lord through these exchanges and I hold this possibility in mind with everything I say.
For the word of God is alive and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart. Nothing in all creation is hidden from God’s sight. Everything is uncovered and laid bare before the eyes of him to whom we must give account. (Hebrews 4:12-13)