I dunno, Jon.
I’ve never been able to understand how the Church practiced
sola scriptura during the lifetimes of the Apostles nor in the first couple of centuries prior to the formal establishment of the canon. After all, you have to have scripture before you can rely on scripture alone.
And I don’t see any specific instructions recorded in scripture from the apostles telling their followers to adhere exclusively to scripture as the norm after their deaths or the deaths of the men whom they had taken such great pains to appoint as their successors (such as Papias, Clement, Ignatius, etc.).
Paul specifically tells Timothy to entrust the gospel to men who would faithfully hand on what Paul had taught. He did not say, “Okay, once I’m gone, I want all of you to focus exclusively on what I’ve written.”
If that had been Paul’s intent, wouldn’t it have made sense for him to write a more comprehensive book of systematic theology? If that had been GOD’s intent, don’t you think the Holy Spirit would have inspired such a work?
So, were the Christian churches wrong for teaching that doctrine is derived from both Scripture and Tradition for the first 1,500 years?