She didn’t need it. Great singers don’t. There was a time when singing consistently in tune was actually a thing on which to pride oneself. But somewhere over the last 15 years or so, the general public stopped giving a shit about it. Or even noticing.
WSJ to Aretha Franklin: What do you think of Autotune?
Aretha: What is Autotune? I don't even know what Autotune is