Anon, I think you are crossing into open dishonesty. Ypu are quoting a Rambam about strange statements in Chazal as a marker for what he would have held about normal Sugyos that you decided to classify as Agada.
It so happens that the Rambam in his Sefarim take Agada and Medrash very plainly and usually literally. The Moreh Nevuchim, for example, quotes Midrashim quite often and almost always for their plain and straightforward meaning.
This is especially true for this very topic, where I have shown you that he quotes it as the actual intention of the Pasuk.
And again, it is not a Mitzvah all its own. But it is mentioned by Shlomo Hamelech, and understood by Chazal as a warning.