I’m going to break this out into chunks, because there is a lot to unpack.
The ticklish part comes in whether or not to adopt Jewish traditions which developed during, what is known in Christian circles, as the inter-testamental period.
This is a Protestant construction. Catholics don’t speak like this, because well some of the writings were written in this period. Also, one other things, there is a lot that all Christians have maintained from the Jewish Traditions. Much of our doctrines are also originally Jewish doctrines, why? Well because all of Scripture is written by Hebrews, and our Lord and His Apostles and most of the leaders of the first century were Jews.
None of these traditions were framed as being commandments from the LORD.
They aren’t? How do you know? Were you there? Our faith says that yes Christ taught the Apostles and the Apostles His Church. All of these Commandments from our Lord we still do. Prayer for the Dead for example predates Christianity, and evidence from the earliest Christians shows that they did not do away with this practice. And by the way Jews even today pray for their dead, along with the majority of Christians.
In fact, Judaism had fragmented considerably in the centuries leading up to Jesus Christ. We have, for example, the Sadducees versus the Pharisees, not to mention the scribes. The theology of Jesus Christ was decidedly on the side of the Pharisees (the belief in the bodily resurrection and the existences of angels and demons, to mention a couple of major concepts). There are numerous books from this period, as evidenced by the Dead Sea scrolls, which were considered part of the Jewish canon of scripture by some segments of Judaism, but not necessarily by all, nor by succeeding Christians.
On this part I agree. This is why Protestants do not have a leg to stand on, proposing that the canon of the OT was already fixed prior to Christ.
The Jews subsequently established their canon of scripture to exclude all the dodgy books that postdated Daniel. This was said to have occurred at the alleged Council of Jamnia in A. D. 70, although this has been hotly debated.
Jamnia is not hotly debated. It did not happen. That is just historical fact, no matter what Protestant history books claim.
The bottom line with the Jewish canon is that it includes all of the Masoretic texts and excludes all others. That left a large amount of textual material for the Church to work through.
This really isn’t true. 1) From the historical record it seems that the Jews were figuring out their canon about the same time as the Christians. 2) The Jews have a pretty fluid view of Scripture, from what I have read. The Talmud and Haggadah for sure are considered Sacred writings. The Mishnah and Kabbalah are also viewed as such as well, with at least some sects of Jews.
Now concerning the Masoretic texts, which are the texts every single Protestant Bible translates their OT from with some variations, and now sadly modern Catholic Bibles, is actually a Jewish revision of the Hebrew texts somewhere between the 7th and 10th centuries. Oddly enough the Vulgate is an earlier witness to the Hebrew texts than the Masoretic texts.
The Ethiopian Orthodox Church decided to be inclusive and has the largest canon of scripture of any Christian branch. The largest branches of Christianity, which are the EOC and the CC, settled on 73 books.
The Ethiopian Church seems to have grown in obscurity for the most part. Don’t think there is any evidence that they were represented at any of the Ecumenical Councils, so there is some question of how much interaction there was between that Church and the rest of Christendom. So, their OT texts come from the Ethiopian Jewish Bible, and not the LXX or Hebrew.
That, in a nutshell, is how you got to where you are at. BTW, the EOC does not believe in Purgatory, not having found it in their canon of scripture.