I understand your point. However Jesus Christ tells us the authority we must follow:
Matthew 4:4 NKJV
But He answered and said, “It is written, ‘Man shall not live by bread alone, but by every word that proceeds from the mouth of God.’ ”
And many of those words of Jesus were NOT written down.
The Apostles watched Jesus and listened to him, and they adopted his habits to a point, which became tradition even if not written in Scripture.
I taught my kids to ride bicycles with no written material.
Just because I did not write it down does not mean it did not happen, or that I did not, likewise, learn from my Father.
Jesus Christ tells us the authority we must follow:...Matthew 4:4 NKJV
But He answered and said, “It is written, ‘Man shall not live by bread alone, but by every word that proceeds from the mouth of God.
Amen!If someone doesn’t accept that God is perfectly capable and willing to use His word as the compass for our life...and the authority of which He claims that it is... Then frankly people will gravitate to ‘any other source’ of information no matter who claims it or publishes it.