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It's because Gamefreak takes you buying these games for granted. For all the bitching and moaning, Gamefreak feels safe enough in alienating or not catering to portions of their fanbase because a lot of their fanbase started as children and buy the games out of brand faithfulness.
I know I did until last Gen and now I've stopped and I don't think I won't ever buy a game before getting the information. Gamefreak only makes changes to get new consumers into the games and sell new merch.
If you want Gamefreak to make things you like, stop buying the games. People will tell you how pointless it is and that you not buying the game won't have any effect, but the ultimate effect it'll have is the one on you. You'll find something else to play that matches your tastes better or hell, you might even start making your own game to try and capture what you want.