Large commercial breeders are concerned with churning out numbers and not much else. The mothers are just used as breeding machines and so they have no real idea what characters are and pups will inherit some of their character form her. They will also get minimal handling, socialising and interaction as they are raised, again all of which help them become the family dogs people want. A commercial breeder who does not openly tell you what they do with the bitches they retire also horrifies me, do they sell them, dump them in rescue or put to sleep as no longer needed?
In contrast my last pup (not a cockapoo) was born in a family home, pups and mum spent first few weeks in a quiet area at the bottom of the garden and were then bought into the living room where they were handled every dad and got to explore as well as experience all of the sights and sounds of family life. My pups mum is still living as part of her family as the well loved dog she is.
The recommended breeders list is set up by breeders and ran by breeders - it has standards of testing but very little else.