By what objective standard were The Acts of Andrew, The Acts of John, The Acts of Paul, The Apocalypse of Peter, The Epistle of Barnabas, The Gospel of Hebrews, The Gospel of Matthias, The Gospel of Thomas, The Shepherd of Hermas, The Teachings of the Apostles, The Gospel of Peter, The Gospel of Thomas, The Gospel of Matthias, The Acts of Andrew, The Acts of John, The Gospel of Mary, The Gospel of Truth, The Gospel of Philip, The Gospel of Judas, and the hundreds of other contemporaneously authored documents excluded from the Canon of Scripture?
Perhaps God didn't figure he had to wait for your group to analyze what he had determined should be...Likely those works you mentioned were written after the last book of the Scriptures, Revelation...
We know what the OT is since the oracles were given to the Jews...Whatever they have for the OT is what is God ordained...
The World starts with the Creation which is Genesis...The World ends with Revelation...
Peter knew what scripture was...All the Apostles knew what scripture was...And John finished up with the last book of scripture...When John wrote, even so, come Lord Jesus, the bible was finished...By 100 AD....