Here is an interesting take on why the Apocrypha is not considered part of the Christian Bible (i.e. Protestant Bible). I found it a fascinating read:
https://pastorunlikely.com/did-martin-luther-remove-books-from-the-bible-a-pastors-answer/
Finding this link arose out of a conversation my love and I had while we were praying and studying Scripture. Our study time led us to the book of Esther, and as we read through it it was pointed out that this was the only book in the Bible that didn't mention God by name, although it certainly described events and miracles in which their occurrences could only have pointed to Him.
This led to the question of whether Martin Luther tried to remove or downgrade other books that have remained in Scripture, and the answer was yes:
... Genesis, Exodus, Leviticus, Numbers, Deuteronomy, Esther, Job, Ecclesiastes, Jonah, Matthew, Luke, John, Acts, Romans, Hebrews, James, Jude and Revelation ...
As I kept digging, I then found the article which I linked at the beginning of this post.
Happy reading!