It's more that the balance in usefulness vs waste of time shifts into the other direction after a few times spending long time getting it right and just doing it yourself anyway.
The part I was responding to was this:
> when the duck actually has read the Internet and has useful suggestions and ideas back to share
I think that if it does that, it's legitimately less useful as a rubber duck. I'm not saying it isn't useful -- it's just not useful as a rubber duck anymore.