>>33366786Black and White were what made them good.
After starting out with a game with a decent yet incomplete feeling story, a complete lack of old Pokémon (AKA Pokémon people playing the series already liked) during the main game, a completely linear map main story map and very little post game it was easy to make something far better as a follow up.
All they had to do was listen to players, which they did for B2/W2 (ran with the story, added old Pokémon for the story, made the region slightly less linear, added difficulty settings which we'd wanted forever, added old characters in the PWT as extra post game content, did more with Hidden Abilities to make for more exploration and to not lock them all behind the Dream World).
Then decided to never do again because apparently it was too successful.
Though I'd wager a lot of the things dropped was the Game Sync's fault. You know they're tracking the data to see what features people are using and deciding to drop the less used ones because they're idiots who are trying to grow their player base and don't realize removing/heavily changing features changes/shrinks your player base, it doesn't grow it.