What is this Simon Cowell stuff y'all are on... I guarantee you, most listeners are not dissecting Monica's music, or Brandy's either for that matter, based on this meticulous stuff. @dora_da_destroyer is correct about this- obviously having a good voice is important, but listeners of music do not spend this much energy about any of this stuff. If that was the case, Janet Jackson wouldn't have blown, Aaliyah wouldn't have blown, MJB wouldn't have blown, etc...
This.
I've only seen Brandy stans do that. Years ago, right around Afrodisiac, Brandy stans were out in full force. I remember a Brandy stan posting a list that contained the vocal range for nearly every R&B and Pop vocalist of the past 20 years. It listed octaves and how many registers each artist had mastered. It was crazy. I never seen anything like that before.