I see people talking about a potential Mario Maker 3 on Switch 2. Whenever it's going to be released (be it soon or in a few years), I predict it's going to be called Mario Maker 3D, because it's going to allow you to build Mario 3D World levels.

Warioworld. It's just overall very well suited to be speedrun. It's almost entirely execution-based and doesn't have any long cutscenes or autoscrollers and barely any RNG. It's just 45 minutes (any%) or 75 minutes (100%) of nice to watch gameplay.