Thankfully I am able to hear! Diana Ross has a tone to her voice that is unique. If your ears have the ability to appreciate phrasing, enunciation , sweetness, tenderness…you would recognize her voice is among the best. Sadly too many associate gut wrenching, screaming, shouting, vocalists as “being able to Sing!”.
Fortunately the renowned singers aforementioned-have all been able to appreciate Diana Ross’ unique vocal abilities-and would agree that she is among the best.
So in conclusion, I would argue that those of the opinion that Diana Ross can’t sing- have missed the contributions of one of the most influential music icons of our time.