Whenever Nintendo has any mild success they also milk it like the others and they do it on a budget taking minimum risks.Depend what flagships you are talking about. Pokemon... Animal Crossing on Switch has less features than 3DS. I don't know how can they achieve that.
Mario and Pokemon, and now Zelda are carrying Nintendo hard.
It's not like they were creating a new IPs like Mario, Pokemon or Zelda every gen. The younger of those IPs is close to 30yo already.