About the Didache
I disagree with your conclusions. If we want to see how Christians in the first century worshipped, the Didache gives us an answer that is completely contrary to your video.
If we want to see what Christian assemblies were like in the first century, I prefer to rely on the well-attested first century documents as we have in the New Testament. We are fortunate to have hundreds of copies of the New Testament documents, dating back as early as the second and third centuries.
However, we have only one (mostly) complete copy of the Didache, and it wasn’t discovered until 1873. And that copy does not date to the early centuries; it dates to about 1055, a thousand years after the birth of Christianity. In other words, we don’t know how many additions or redactions had occurred to the document between 100 and 1055 AD. We also don’t know the author or authors of the Didache.
While the Didache has been thought to have been first drafted ca. 100 AD, it is likely a composite document that was changed and updated over time, much like similar “church manuals” produced in the early centuries. Good examples of such manuals include the Apostolic Tradition, commonly attributed to Hippolytus of Rome in the 3rd century, and the Apostolic Constitutions, commonly ascribed to the late 4th century.
Another problem with the Didache is its first line, which claims that it is “The teaching of the Lord … by the twelve apostles.” I know of no one who seriously thinks that the 12 apostles drafted the document, or that Jesus personally dictated it to the twelve. In the second Christian century, many spurious Christian documents were produced, falsely claiming to be from apostles. Good examples are the Gospel of Thomas, the Gospel of Judas, the Acts of Peter, the Apocalypse of Peter, and dozens more.
I’m not saying that the document is worthless. The Didache belongs in a category of valuable post-New Testament writings that reveal a snapshot of Christian thinking at a particular time, in a particular place, by a particular author.
But if we want to see what Christians actually did in the first century, we have an abundance of evidence in our New Testament. After the apostolic period, many substantial changes to church practice and doctrine developed, as I have demonstrated in Video #6 How the Later Church Developed Worship Services and in my paper, The Shift: How the Early Church Evolved from House Meetings to Temple Worship.
One should also remember that the 27 New Testament books are widely regarded as authoritative throughout Christendom. But I know of no Christian church that regards the Didache as authoritative, with the possible exception of the Ethiopian Orthodox Tewahedo Church. That Ethiopian church accepts the Didascalia, which is a third-century writing similar to the Didache.