Any final, infallible authority requires circular reasoning--(since logically, no higher authority can validate it but itself), which as you can see, applies to "Sacred Tradition" in the say way you attempted to apply it to scripture.
You can either rely on the written testimony of the Apostles themselves (the bible) or have faith that some (repeatedly, over and over and over) demonstrably corrupt (heard anything about homosexual predator priests being moved around lately??) institution is somehow, in some limited, undefined sense "infallible" in telling you that what (undefined) tradition mixed with the bible....says.
As for me and my house, we'll follow God's word, not that of an old, VERY FALLIBLE, human institution based in the pagan capital of the ancient world.
The writings of the apostles were scripture from the time the ink dried on the page--and didn't need official approval of the Bishop of Rome to become that way. They are the self-identified only final authority, the Word of God--which all of the Church is bound to obey.
So says Pope AnalogReigns I
please provide the “self identified” canon of Scripture you speak of.
also, “bound to obey”
who is obeying Scripture concerning infant baptism, the Baptist or the Lutheran?
do we flip a coin or do we say doctrine doesn’t matter?
who is obeying Scripture, the Reformed or the Methodist when it come to 5 point Calvinism?
again flip a coin or doctrine doesn’t matter?
who is obeying Scripture when it comes to the Eucharist, the Anglican or the Presbyterian?
Oneness or Trinity?
when all is said and done, your way leads everyone to be their own Pope, with a requirement to obey only what THEY think the Bible teaches. it denies Matthew 28 where Jesus gave the Church AUTHORITY to teach, it also gives us a requirement to believe and pass this teaching on.
this is what has happened for 2,000 years!