Scriptura Christianity was born at Pentecost. Sola scriptura Christianity was unknown until the Lollards invented it in the 13th century, and unrealistic until the invention of the printing press by Gutenberg.
An authentically Biblical Christian hears Paul when he commends the Thessalonians for adhering to the traditions he taught them, "whether by letter or by word of mouth".
But I don't sneer at sola scriptura; I mourn it. Because of it, the Body of Christ is riven by thousands of divisions.