Curtain, hits and albums don't often reflect vocal reputation. While obviously varying to each individual, her fame is at least equally in part due to her compositions as it is to her own records, which were a second-wave success story in her life.
She is obviously an extremely talented composer and singer. But her financial success in the industry is not solely due to one facet (or the other.) It does not support your argument (the way that, say, King's Induction in the Rock & Roll Hall of Fame in 1988 as a Non-Performer for her songwriting alongside Gerry Goffin would support the argument that she is more revered for her composition than her vocals.)
Words don't deserve that kind of malarkey. They're innocent, neutral, precise, standing for this, describing that, meaning the other, so if you look after them you can build bridges across incomprehension and chaos. But when they get their corners knocked off, they're no good anymore…I don't think writers are sacred, but words are. They deserve respect. If you get the right ones in the right order, you can nudge the world a little.