I meant to add, but forgot to, that the acronmym KISS (keep is simple
stupid) is a good one, and Occam's razor "when you have two competing
theories that make exactly the same predictions, the simpler one is the
better" is the way I generally try to approach things.
Occam's further thought that "plurality should not be posited without
necessity" is germane to these authorship issues .
When competing hypotheses are equal in other respects, the principle
recommends selection of the hypothesis that introduces the fewest
assumptions and postulates the fewest entities while still sufficiently
answering the question. I think Mosaic authorship of the Pentateuch and
the other authors of their respective books fulfills these general
principles. Even if I am incorrect, does adding unknown authors, with
whatever motivation, bring us any closer to understanding what the text
says. Much of this is largely due to the advent of Higher Criticism,
which I believe to be largely rationalistic in nature, and which I fear
has muddied the scholarly and theological waters.