It's probably because Game Freak was almost annually releasing games.

I honestly wouldn't care if they decided to stop drawing stories for the remake games and focus mostly on the main games. The chapters based on the remakes are pretty much never good anyways, the thing I like about them the most is that you get to see the old characters again but instead of being restrained by time by creating stories for the game remakes, they could instead create a second ongoing original story that the older characters could appear in.

What do you guys think?