Do you say that the Apostles’ preaching had less authority than their writing?
Would that cause us to accept the corollary that the seven of the Twelve who in their First century missionary zeal founded many local churches but left *NO* writings, had little or no authority?
And the churches which had no Scriptures, were they really churches? Were the believers in, for instance, the churches founded by St. Thomas, being Scriptureless, for that reason not Christian?
“Do you say that the Apostles’ preaching had less authority than their writing?”
The Apostles themselves had authority and were the foundation stones of the Church.
Churches can exist with no Scriptures - and do today.