It is obvious, at least to me, that no one can manage or nourish their faith by the bible alone. It is an incomplete record, and was never intended to be complete. John tells us that it cannot be complete, as the world will not hold the volumes that would be written. The Gospel message is a living word, that requires that God-given authority be behind that living word. The bible, aside from not being a sole rule of faith, is not a living authority which can explain the meaning of its words. In only two examples from scripture (Nehemiah 8:5-8 and Acts 8:26-35), we see that God always sends someone in His name - someone with the authority to give the sense of the scriptures and cause the people to understand them.
Again, from scripture (Acts 8:9-24, Acts 19:13-16), we see also the fates of those who send themselves, and who rely on their own authority.
The post-reformation employment of bible alone (thus, an incomplete Gospel) has lead, not to unity, but to ever increasing division. How can that doctrine be of God? It cannot! The Holy Spirit, always and everwhere, leads to humble submission and unity. The use of the bible alone demands an ego to interpret. The problem is that each ego then indulges itself rather than denying itself. Division inevitably follows. We are drowning in the proof of that.
It is impossible to form a faith or belief system without adding to the written record - especially if that written record is admittedly incomplete, and was never intended as a sole rule. The bible itself is a Tradition, having been handed on to us from prior generations. “Handed on” is the very definition of “tradition.” So, we see the term tradition constantly bad-mouthed, even though Paul admonished the Thessalonians to hold fast to both oral and written tradition (2 Thessalonians 2:14).
If you read the bible for entertainment, you may use it alone. If you seek to found your faith upon it, you will need to add your own content. The disagreement and disunity in all of protestantism comes from that added human content.