On the one hand, I agree, Mario is about platforming.
On the other, people are going to make those levels anyway, so throwing those creators (and all creators) a few big bones so they don't have to keep relying on POW Block pedestals, or Bowser Jr. in a clown car where the exit is high up or Big Bowser in a tiny room with fire flowers or whatever, then go for it.
It's like, I don't really care that much for the shmup levels either, but Nintendo decided to make it easier by making the fire clown car so people didn't need to keep having Fire Flowers spawn and shoot at awkward angles.