I certainly wouldn't want to be "Bible alone"--the codifiers forgot to include (at least) books like Enoch (whereas it was considered worthy to be cited, thus treated as Scripture, in
Jude 1:14), as well as the text, probably a midrash, Paul cited in
1 Corinthians 10 "the Rock that followed them".
At the very least I would want to take seriously texts the "accepted" Scriptures relied on!
Not only that, but I remember a Russian Orthodox once proved to me that I should take the Apocrypha (what Protestants reject but the Catholics and Orthodox have accepted as divinely inspired) seriously!
I do say "Scripture is Supreme" though--especially the "Old Testament" Scriptures (they were what "Scripture" referred to in the NT writings)--it's God Himself speaking after all!
I don't know. We all quote things from imperfect sources only because the part we're quoting is relevant. Enoch is not, in my view, pure truth. So it should not be included in Scriptures, even though it may be useful as a source for ancient beliefs, and sometimes even ancient truths.
The basis upon which Scriptures are determined are, as follows (as I understand it). The Jewish Scriptures were determined by the Jews. They may have categorized their books differently from Christians, but in matters, such as Daniel, we do see Jesus quoting him, endowing him with prophetic authority.
But just quoting something does not automatically endow the writer with Scriptural authority. If he is a prophet, like Daniel, that is so. But claiming someone is the authentic "Enoch" is another thing entirely. Nobody is quoting "Enoch the Prophet."
As to the NT, Jesus specifically chose his Apostles precisely because they were to spend enough time with him personally that they could reliably convey true doctrine, without error, to others. This doesn't mean that the Apostles were capable of inerrant behavior--only that they could convey the truth, responsibly, from an inerrant person, namely Christ.
So those known in the Early Church to be apostles, like Peter, John, and Paul, could be trusted to convey truth that is pure for the Church. Paul didn't spend 3 years with Jesus, but he was called, as all acknowledge. And he did consult with the apostles of Christ.
When these apostles wrote their doctrines down, it was precisely for the purpose of preserving Christian truth, pure and reliable. And so, we would call their writings "Scriptures," when they were written precisely so as to codify Christian beliefs for the historic Church.
Other leaders, like James and Jude, may have been of the family of Jesus, and as such, were more than capable of conveying the pure truths of Jesus' teaching, even if Jude quoted Enoch. Mark and Luke were very close associates with the apostles, and gifted to be able to convey these same truths. Luke was an historian, capable of not just conveying truths of the Gospel, but also capable of conveying an accurate accounting of the apostles' adventures.