I think I was thrown off by the "trackpad" example that was given above. That would have been a bit more complex than just a simple button press (which is still doable in low level firmware) but I was curious how they would pull it off.
I looked up what "solid state buttons" are and it makes a lot more sense now. This isn't like some trackpad you can swipe along the endge, they're still buttons in separate locations, just not in the mechanical clicking sense that we're used to.