Ha. Since when does Nintendo care about ensuring functionality they add to their devices are leveraged? Other than first party games, and even that can be limited, almost no one ever implements the weird little functionality they add to their devices.
Microsoft is somewhat to blame for new controller features being underutilized because they're extremely reluctant to add anything to the Xbox controller. Motion control in particular stands out, the hardware isn't expensive and it's proven to be very useful in some types of game, but the lowest common denominator Xbox controller still doesn't have it so multi-platform games can't be designed around it. Especially multiplayer games with crossplay since you can't let some players have more precise inputs than others.
Not just Nintendo. The PlayStation 4 controller had that touchpad in the middle that also clicked in to act as a button. I played a lot of games that used it as a button (usually to open a map, or something) and don't remember a single game that used it as a touchpad.