I completely agree with you. As a songwriter, Michael was probably at his peak here and more creative than ever before or since.
What I don't understand is why many fans barely appreciate the Jacksons' albums Destiny and Triumph. Michael was fully involved in their creation, and everyone involved says he was the driving force behind the brothers. As a songwriter, Michael is also directly involved in more songs than he was on Off the Wall and Thriller. In that respect, I dare say that on Destiny and Triumph, you hear a more authentic, raw Michael Jackson, who was already writing and producing great songs. (Instead of on his solo albums)
Of course, it was his conscious decision to take a step forward with Quincy Jones. But if you want to hear how Michael Jackson sounded without a big producer at his side during the late 1970s and early 1980s, you have to focus on Triumph and Destiny.