Given the factors above are attended to, I have found better digital analyzing or decoding, eliminates much of the after edge from voices.
At times it can be difficult to tell if it's entirely the recording, the artist's enounciation, or the replay gear itself.
Reba mcEntire's voice is one of the best on the planet, superior range, emmotive, and evocative. however many of her recordings don't seem to be done with better audio replay gear in mind. Alan Jackson is in the same camp, production wise.
I feel the producer of the album is largely responsible too for artifacts in it's content. though keep in mind whose audience these recordings are targeted for as to the why of it. It wasn't long ago that some genres were mixed in such a way as to be replayed, primarily on a single speaker car radio... or just boom boxes. R&B, Rock, Blues, Pop, etc.
Bluegrass & Folk, for instance is not far removed from being tilted more towards a content oriented sector. Today that same group of devotees are older and consequently possess better replay devices. Add in further refinements in electronic recording gear, and today's 'grass by and large, sounds excellent regardless the level of gear.
Top tier artists also usually get better studio efforts... though not always.
If you pay attention to the producer of the great sounding albums more so than the artists, you'll find you amass a better level of quality recordins in your library.