Remember, Paul congratulated the Bereans for being "MORE NOBLE" not because they did not accept ORAL APOSTOLIC TEACHING without first confirming it by the WRITTEN SCRIPTURES!
Acts 17:11
These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so.
Hence, oral tradition was never given to take precedence over the written scriptures but rather must be first submitted and confirmed by the written scriptures (Isa. 8:20).
Learning through Oral Apostolic Tradition
Matt. 15:3 - Jesus condemns human traditions that void God's word. Some Protestants use this verse to condemn all tradition. But this verse has nothing to do with the tradition we must obey that was handed down to us from the apostles. (Here, the Pharisees, in their human tradition, gave goods to the temple to avoid taking care of their parents, and this voids God's law of honoring one's father and mother.)
The truth is that many of Rome's doctrines are not only very similiar to the traditions of the Pharisees but many are far worse violations of God's Word. Maryolotry, the mass, baptismal regeneration all originate with Babylonian paganism.
Acts 2:42 - the members obeyed apostolic tradition (doctrine, prayers, and the breaking of bread). Their obedience was not to the Scriptures alone. Tradition (in Greek, "paradosis") means "to hand on" teaching.
Again, the apostles teachings were from Christ who based his gospel on the scriptures (Lk. 24:24-25; 42-44) and his teachings he consistently supported by the WRITTEN scriptures. The Apostles confirmed the gospel they preached was "ACCORDING TO THE SCRIPTURES" (1 Cor. 15:4-5; Acts 26:22-23) and were aware they were providing scriptures for the foundation of the Lord's congregations (2 Pet. 3:15-17).
Acts 20:7 - this verse gives us a glimpse of Christian worship on Sunday, but changing the Lord's day from Saturday to Sunday is understood primarily from oral apostolic tradition.
The first three hundred years prior to Constantine the early Christians observed Sunday not because of oral traditions but because they repeatedly stated over and over and over and over again the very same reason was that Christ rose from the grave on the first day of the week which is written in the scriptures.
John 17:20 - Jesus prays for all who believe in Him through the oral word of the apostles. Jesus protects oral apostolic teaching.
False! Go back to verse 17 and you will see that it is "Thy Word" the written word he has in view and the prediction that the Holy Spirit would lead them into providing the New Testament scriptures as a fulfillment of Isaiah 8:16-18 confirmed by Hebrews 2:3-4,12-13 and completed by John - Rev. 1:3; 22:18-20.
1 Cor. 11:2 - Paul commends the faithful for maintaining the apostolic tradition that they have received. The oral word is preserved and protected by the Spirit.
Until scriptures were provided the oral teaching of the apostles was the only thing Paul could refer them to in regard to New Testament congregational policies and doctrine. However, later as the apostolic scriptures were produced he added to the oral teaching those writings as scriptures (2 Thes. 2:13) and ultimately by the end of his life he was directing preachers to only the scriptures as the complete and final authority for faith and practice (2 Tim. 3:16-17).
So of course all the scriptures you list about his oral teaching was simply TRANSITIONAL until something "MORE SURE" could substitute for them as the latter depending totally upon fallible memory.
1 Thess.1:5 – our gospel came to you not only in word, but in the power of the Holy Spirit. Paul is referring to the oral tradition which the Thessalonians had previously received. There is never any instruction to abandon these previous teachings; to the contrary, they are to be followed as the word of God.
He is not referring to "oral tradition" but to the gospel he preached which was "according to the scriptures."
1 Tim. 6:20 - guard what has been "entrusted" to you. The word "entrusted" is "paratheke" which means a "deposit." Oral tradition is part of what the Church has always called the Deposit of Faith.
The trouble is that Rome has repudiated what was "entrusted" by false doctrine and practice that the written Word of God explicitly condemns as apostate errors. Paul goes on in the second letter to establish what is final authority to distinguish between false traditions and the true oral traditions:
16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
17 That the man of God may be perfect, throughly furnished unto all good works.
1 ¶ I charge thee therefore before God, and the Lord Jesus Christ, who shall judge the quick and the dead at his appearing and his kingdom;
2 Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine.
3 For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;
4 And they shall turn away their ears from the truth, and shall be turned unto fables.
Hence, Catholic Answers simply READ INTO (esigesis) these texts what is simply not there.
1. Oral teaching is to be verified by the scriptures - Acts 17:11 and those who do this are "MORE NOBLE" than those who do not.
2. Oral teaching is to be verified by the scriptures because it is weaker than the scriptures as it depends upon fallible uninspired memories.
3. Oral teaching is TRANSITORY in all generations from the first prophet (Moses) to the last prophet (John) but scriptures are "MORE SURE" and the permenant record God has assigned to represent the prophets to future generations in order to establish doctrine and practice.
4. Oral teaching was always consistent with the writings of the prophet and therefore equally applicable to those actually HEARING them. There is no promise in the scriptures that the oral teachings of the prophets would be ORALLY preserved to any who did not HEAR them.
5. If God designed permenant perpetuation of the oral teachings of the prophets by ORAL traditions dependent upon MEMORY then there is absolutely no value in perpetuating written scriptures. The truth is that God's design for scriptures is to perpetuate exactly and only what the Holy Spirit wanted to be preserved for future generations as the sole basis of faith and practice.