Because Mario 64, Mario Sunshine, Mario Galaxy, and Mario 3D World all play about as similar to each other as Gears of War, 2, 3, and 4? Metroid Prime doesn't quite play like Super Metroid or Metroid Other M. Zelda OoT, Skyward Sword, and Breath of the Wild all play the same right?Nintendo franchises don’t change more than any other long time franchises. Sony, Microsoft and everybody else has new IPs, and I never denied Nintendo games have a gameplay focus. That’s what they do best.
You just can't give Nintendo credit can you? I criticize Nintendo all the time as they deserve to be but they do well to reinvent franchises all the time and switch up the play mechanics.