There's no Frontier or Gym Leader rematches which were the only notable post-game in Emerald, and RS had pretty much no post-game itself.
It did add quite a few things though, and I'd say it's equal to Emerald overall if you count them all, but not all of those appeal to everyone, so some will dismiss them. There's also definitely nothing with the sheer longevity of the Frontier, but can't have that, we want people to participate in the Pokemon World Championships!
