I disagree with the secondary characters. While they don't fight as often in Super, they do frequently show how they are living their peaceful 'retired from fighting' lives and are seen happy with their families now. GT just forgot they existed save for Baby Saga
Super 17 Arc and the final battle of the Shadow Dragons Arc: "Are we a joke to you?"
Yes. That’s exactly my thoughts. They were all treated like jokes, just fodder and might as well not even have been there.