ArdWar, you were commenting on the reduction of buttons (extreme case to one button), well I just was reading about HEADSET competition between Meta and Apple, with details on what the differences in approach are; seemed like Apple more interested in augmenting the scene in front of you, while Meta had goal of completely artificial views, for gaming.
But one developer commented that he was ' designing for single button functionality'.
One of my battery clocks has a horrible convoluted button function, with 2 buttons.
Such as "Press f2 three times to exit menu"