Tons of third party controllers for any system clone existing buttons, which is nice when the official controllers don't have that. Something interesting about doing this on a switch is that because each joy con is its own independent controller you can only map each joy con to an input from the same joy con, for example, the left wouldn't be able to map to face buttons, and the right wouldn't be able to map to the d pad.

I use a Steam Controller on PC and really enjoy being able to map anything to it which helps being able to play games how I want. Cloning buttons is great for the whole "retain joystick movement while hitting a face button", but without being able to directly map different game controls to it it's just a copy of an existing function you already have.

I would love for grip buttons to be normalized and allow for more controls in games, it's pretty much the last part of my hands that aren't doing anything on a modern controller layout.