People use the 1 new pokemon Game per year as a way to cope or defend gamefreak's lazyness

In SM there was a planned golf zone that was removed but even in USM was not included to get garbage like the Pikachu's valley

Generations last 3 years,if they REALLY wanted they could add all the missing stuff even as paid DLC but they don't because they even know You are gonna play full price for a incomplete Game again