The butterfly keyboard, introduced in 2015 ... Apple only replaced defective keyboards with the same problematic design. By ...

On a typical keyboard, keys are attached using two pieces of plastic that cross each other and close like a pair of scissors when pressed. The butterfly-keyboard keys instead used a wing-like hinge.

That's all thanks to Apple's revamped scissor key switch mechanism, which includes a newly designed key cap and rubber dome compared to the older Butterfly mechanism. The new keyboard design also ...