One of the pleasures of being an old fart is to declare as fact preconceptions that usually don't stand up to scientific examination (example: women who wear thumb rings have at least one tattoo).
I've noticed over 60 years of listening to popular music that the deeper voices in men (and the higher ones in women) are rarely successful in the popular arena. There were exceptions (Barry White, Big Bopper, Tenessee Ernie Ford spring to mind) but men who sing high, and falsetto is often a feature of pop songs, seem to do best. Any theories as to why (if true?). I'm a fan of the deeper voice and never managed falsetto myself.

RtS
(Just fewer basses about?)