This is a weird one, but I’d love to see a reimplementation of the sensor bar. The gyro controls haven’t cut it for me. I like how the Wii U game pad had the sensor bar built in to the bezel. The real engineering nightmare would be squeezing IR cameras into the top of the Joycon
Backward compatibility isn’t just for replaying old games. It’s so that I can also play all the Switch games I haven’t played yet, on newer hardware. Or for people new to Nintendo, who haven’t bought the Switch can play all the games released on the system too.