Sola Scriptura is overrated, the first christians didn't need it so neither do we.
Please explain.
What is your understanding of Sola Scriptura?
What did the early church fathers use to refute heretics? It wasn't their own homilies and list of bishops.
They used the OT and NT Scriptures at their disposal. They did so prior to anyone compiling the books into the Bible.
What many overlook is our early church fathers did not make the Gospels and Epistles authoritative. They recognized by being filled with the Holy Spirit the authoritative nature of the Scriptures in their possession.
So your premise in the OP is incorrect.
The very earliest church fathers used Holy Scriptures to refute heretics and deliver sermons to the faithful.
Here's an example from St Ireneaus :
Against Heresies (Book III, Chapter 1)
1. We have learned from none others the plan of our
salvation, than from those through whom the
Gospel has come down to us,
which they did at one time proclaim in public, and, at a later period, by the will of God, handed down to us in the Scriptures, to be the ground and pillar of our faith. For it is unlawful to assert that they preached before they possessed perfect
knowledge, as some do even venture to say, boasting themselves as improvers of the
apostles. For, after our Lord rose from the dead, [the
apostles] were invested with power from on high when the
Holy Spirit came down [upon them], were filled from all [His gifts], and had perfect
knowledge: they departed to the ends of the earth, preaching the glad tidings of the
good things [sent] from God to us, and proclaiming the peace of heaven to
men, who indeed do all equally and individually possess the
Gospel of
God. Matthew also issued a written
Gospel among the Hebrews in their own dialect, while Peter and
Paul were preaching at
Rome, and laying the foundations of the
Church. After their departure, Mark, the
disciple and interpreter of Peter, did also hand down to us in writing what had been preached by Peter. Luke also, the companion of
Paul, recorded in a book the
Gospel preached by him. Afterwards, John, the
disciple of the Lord, who also had leaned upon His breast, did himself publish a
Gospel during his residence at
Ephesus in Asia.
CHURCH FATHERS: Against Heresies, III.1 (St. Irenaeus)