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Because while the main story and Delta chapter is done very well, the game does still have the very real problem of not having a lot of the cool stuff from 10 years ago (not just Battle Frontier, but stuff like going to the 2nd floor of Granite Cave earlier, Safari one working like an actual Safari Zone, Gym Leaders getting improved teams in rematches, holy shit why is that not here)
Its actually kind of annoying, its does so much stuff right but still fucks up on some fundamental things that could've made it literally the best games in the series. This is why I'm hoping that we get a patch that adds stuff instead of asking us to buy another 3rd version to get what should've have already been here.