“But no worries, you don’t need to hear all of it because for you “all” of it was written down”
Iscool never said that. He said that everything that was necessary for our salvation was written down. Do you dispute that? Is there some secret formula for salvation which isn’t included in the New Testament that the Catholic church has kept to itself all these years? Or do you believe that the Gospel of Christ is sufficient to show us the way?
Short answer: No. Why? Because Scriptural text can be interpreted a million different ways and so much depends on how Peter, the other Apostles, and their successors understood and applied His teachings. This is most manifest in the Holy Eucharist and the Catholic Mass. Indeed, at the very outset it was the early Church Fathers who decided on what books would be admitted as authentic Gospel and Biblical writings and what ought to be excluded.