The DeuteroCanon is, if I remember correctly, some of the books in the Septuagint for which Jewish scholars could not find originals in Hebrew.
The story goes (I don’t know if this is true, but I will accept it for arguments sake) that the scholars saw in these works underpinnings for some very Christian beliefs, and Christians were using reference to them in efforts to convince Jews to convert. So they restricted the Jewish canon of scripture to not include them. It was censorship.
Jerome noticed that the Jews were not using these books, and so did many other scholars.
Protestants were not the first to consider deleting the books, they were following a long list of people who had similar ideas. I think we can see though, how their absence has skewed the thinking of some protestants. I think that reluctance to pray for the dead is directly attributable to the fact that those books (mainly Maccabees) are not commonly read.
But we do this very same thing to ourselves when we pick and choose what we want to read, we might miss some great insight. Reading some, but not all, of Holy Scripture is no sin. It’s better than nothing.
But as to your question … the Holy Scripture is part of tradition, not the other way around. It exists to support the faith. The books selected for the canon of scripture were chosen because they can be read in a way that supports the orthodox Christian faith. Ripping pages out of a Bible will not change the faith, if the bishops, clergy and people are all focused on conserving and preserving the Apostolic Faith as they have received it. They will pray what they believe.
So someone might publish a ‘Readers Digest’ type version of the Bible (and Readers Digest did just that once) which does not include everything to save space and make it more affordable. That’s no sin, a lot of people will purchase a ‘New testament and Psalms’ edition that is easy to carry around (and ignore the entire balance of the Old Testament including the DC). Thank God for that! If they didn’t have that option some people might read nothing at all. :shrug: