I thought it was just a variation of "everyone will stop working!". If a few people stop it's not a problem. We need enough productivity to keep things going but working a useless job is a problem. Working for no reason and no purpose. Work for the sake of working. Work consumes resources, we shouldn't spend finite resources on things we don't need. You can just sit there and think of something to contribute to society. That is, if we are worthy of such flattery in your experience.