What accounts for differing views on the relation between muwāzanah and sajʿ?

Sajʿ and Muwāzanah: Rhymed Prose, Rhythmic Endings, and Balance

• The number of prepositions
• Only the difference between Qurʾān and Hadith
• Treating pattern and rhyme as separate or potentially coexisting features
• Moving every device to ʿilm al-maʿānī