“And so do Roman Catholics, just as Christians everywhere (including those who would eventually become recognized as ‘Roman’ Catholic) have for centuries.”
Since only Protestants claim sola scriptura it only affects them. Protestants are left with a quandary. They claim to be led by the Holy Spirit (Who cannot lie or deceive) and claim sola scriptura is true. Clearly something is wrong with Protestantism is the result is what it is for certainly nothing is wrong with the Holy Spirit or scripture.
When reading of those whom are referred to as Early Church Fathers, it is undeniable that is a range of opinion expressed -- yet most often also, unity as for essentials.
And how do we know what the essentials are, but that those were written.