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comment Did Paul intend his letters be taken as Scripture?
I concur with @ThaddeusB. Your first paragraph is a good start at answering the question. I think the key element is that since the letters were written for particular purposes, Paul included material that's fairly irrelevant to other parts of the Christian movement. In particular, we faithfully copy the greetings and admonitions to individuals who are no longer known to us. Paul could have saved significant effort in copying those bits if he'd made clear lines between "Scripture" and the rest.
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