I think you'll find they are.They are not.
No. I can point out to you that men like Eirenaeus and Polycarp who quoted from all over the Bible and only from the Bible, years before the various councils and synods, but those men have no authority to bind my conscience any more than the councils do. The fact is that the churches accepted the canon as they received it. The acceptance of the canon by the Council of Carthage was simply a bunch of guys approving what was already common practice.Someone, some group of people had to decide which of the writings that were circulating would be included in the Canon of Scripture that all Christians would accept - and that would be the leaders of the One Universal Christian Church, and the Holy Spirit directed them in that task.
I accept the decisions of councils and synods just as far as they approved the truth, which they sometimes did. But I deny their authority. Many of them were called by Emperors rather than the churches, and some of them were renegade like the 'robber' second synod of Ephesus in 445. Likewise popes have no authority except insofar as they uphold the truth, which they cannot do because there is no such position in the Church. 'Apostolic succession' is a joke. In 1046, the Holy Roman Emperor Henry III came to Rome to be crowned. He found no fewer than three popes (Benedict IX, Sylvester III and Gregory VI) squabbling about who was the real one! So he sacked them all and appointed his own pope, Clement II. So where's your apostolic succession there?