I don't know how big the tradeoff is. AFAIK the modern narrative is - you need physical buttons for tactile feedback. The story generally goes - you are focused

I don't know how big the tradeoff is. AFAIK the modern narrative is - you need physical buttons for tactile feedback. The story generally goes - you are focused on something else like looking at screen while typing on the keyboard or changing volume/temperature while driving. A less common element would be pressing a button in the dark elevator... you really want to see it light up or elevator start moving. We've grew up to expect this... but how much tactile feedback do you get from a thought occurring or turning your head? Given that headset literally controls your vision I think it might be possible to create visual effects that feel as satisfying as a click... Having said that, human experience OS is weird and real world testing is needed.