Determining vocal merit also depends on the ears listening. I’m an instrumentalist/singer and a lot of my friends are musicians, so we predisposed to singers that vocalize as if they’re playing instruments. Me and my boys have (I play keys and the sax) our lil monthly sheds and discuss this stuff a lot. To the common consumer, their favorite male singers would probably be a Stevie, or MJ or Prince, while we would gravitate to a Tank (my favorite male vocalist) because of the level of musicianship in his singing
Most ppl wouldn’t get it cause their ears can’t interpret what’s going on, but to us it’s insane showmanship.