Yeah I've also heard that it's more of an annoyance than it's worth, in fact I'm not really sure of anyone who has said it's a benefit in any way. It's just not really an aspect of music that people usually enjoy anyway. Naturally, music is engineered more to be relatively pitched rather than absolute
It's useful if you're singing a song that starts a cappella and has instruments join later. Admittedly, this is not common. Only example I can think of is The Smashing Pumpkins - Bullet with Butterfly Wings.
