>>49405133It was because the game series backbone (Masuda) lost all hope when people didn't buy his Swansong to the series (Gen 5)
This simply coincided with 3D, it wasn't because of 3D itself, they just put less effort in these games now than they did in gens 1-5.
He stopped caring about the games, just started putting in the motions, and Game Freak doesn't have anyone to replace his role. He's also still around simply putting in the motions, a gen 5 fan should hug him.