Except for the inconvenient fact that until fairly recently people couldn't afford books, which were hand-written and hand-copied. When the original apostles conducted their missionary journeys they had no bibles to hand out. The ancient sacramental churches have converted people just as the original apostles did. Sola scriptura is a ridiculous concept dreamed up as an excuse to secede from the Catholic Church.
And please be advised, I'm not advocating for the Catholic Church here. I merely point out that ancient sacramental chrstianity is the real thing and "Bible Protestantism" is a recent construct that could never have existed in the ancient world. (Judaism is different because it's a mitzvah for every Jew to write a Torah scroll (or have it written for him). Judaism is a book religion; chrstianity is not. So which are you going to choose?
The fact that something is "G-d breathed" does not mean it contains every single doctrine the taught by the religion or all one needs to know. It DOES mean that what is written is absolutely and totally free from error on any subject whatsoever. Both Protestants and Sacramentals tend to conflate Biblical inerrancy with Biblical sufficiency when they are two entirely different things. Unfortunately, the ancient churches have all rejected Biblical inerrancy now as inherently "Protestant."
The Five Books of Moses do indeed contain absolutely everything (since it is what you call the logos) but all this is encoded at a very deep level.
So? Everything the Apostles preached was scripture and their writings were widely read to congregations. The ability to read scripture does not change the fact it is the only infallible rule of faith.