That article has a failed premise. For instance, it states that Jim Morrison could handle his singing style, but others who copied it could not.
So even though a singer CAN pull off a particular style, they ruin music because OTHERS try to do the same and can't? (This seems to be a basic premise of the article.)
Bull****!!!!!!!!!!!!!!!!!!!!
OTOH, I think one of the main offenses to music in the last 20 years is the over-singing and trills that female singers seem obligated to throw into their music. I don't like it when Whitney Houston does it (although she's far from the worst offender), I think it stinks when Mariah Carey does it, and it's even worse (verbiage suitable for this forum fails me) when attempted by the thousands of other female singers who punish us with unending trills and flourishes.
IMO, most of the time all those trills do is cover a lack of ability to sing, while the producer uses pitch adjustment and adds layers of background singers to obscure the fact that the singer stinks.
Women, take a lesson from Ella Fitzgerald, Aretha Franklin, Tina Turner and hundreds of other female singers - LEARN how to sing, and then do so, straight up. Forget the trills.