The point is that the canon of writings assembled into the book is based on how people think at the time. Things change and evolve. A book canonized today would probably undo even more of the old testament teachings as archaic and no longer relevant with their version of Romans 14 and Acts 11:4-6. Francis 2:8-10 or from a series of letters sent to the people of Americas instead of Corinthians. These writings are just a snap shot in time