First off I love her. To me she has the best voice period. And she has her own unique quality that's so effortless. She + her voice are like a Hermes silk scarf.
She can disappear for a decade and still debut with over 500K in the US alone.
But on the other hand, she's not very prolific and therefore not ubiquitous.
Yes, because this is has many classic songs, not just hit
Because this is not music like other music on top 40, this band succesful with no commercial genre.