To add to the speculation, it's possible that the people refusing to use it are working slower. Even if the code that they write is objectively better by any metric you'd like, humans can't really pump out code as fast as Claude or Codex can.

If you can get something into "good enough" territory in 1/10th the time of someone who can get it into "great" territory, that is often worth it.

I genuinely don't believe the rate at which you produce code matters.