Consider it might be free, and everyone is getting it in a downloadable "patch" (actually DLC, but everyone has access to it on the Shop). If they didn't finish it and come out with it later down the line for everyone, that would make it fairly balanced.
And that's extreme wishful thinking. Since when has GF made their event DLC available to everyone without any form of marketing or add on for publicity of any sorts, they have never operated in such convenient way my friend.
And you jumped to the conclusion that ORAS isn't a full game at this point, which is based on your opinions but not on GF perception of their own product.
Just look at XY, instead of patching it they opened 2 independent leagues for each set of games, that is how GF does bro. Their games are final products, the only time they bothered patching something was during the berry glitch(Funny enough it was a RS thing) and most recently with XY bug fixes. And I must emphasize on bug fixing with a small inclusion to plan interactions.
But this is the ORAS discussion, and I can see these games as a final product. Probably with a bug patch in the near future, since we might get a lumiere glitch due to the resources or an overlook, but nothing more.