Your point is clear, but Charli does a lot of production on her albums, so I'm not sure she's the one to make this point about. She's not a once in a lifetime producing genius like Sophie, but she doesn't claim to be. Yung Lean did not produce the sound that made him famous either.

I think in the modern day, due to Internet, access to DAWs, etc, a lot of pop stars actually do/did much more of their own writing and production, see Billie & Finneas or Chappel Roan. It's just much more accessible, there's lots of pretty faces on social media so to really break out, you either need some real connections or real chops.