This is the closest story I found: https://www.bbc.co.uk/news/av/technology-35232827 https://www.bbc.co.uk/news/av/technology-35232827. But I do remember, and I

This is the closest story I found: https://www.bbc.co.uk/news/av/technology-35232827 https://www.bbc.co.uk/news/av/technology-35232827. But I do remember, and I'm sure it was also on the BBC, a piece several years ago where they demonstrated "physical buttons" the the form of reconfigurable raised bumps on a touch screen that was, I think, either on a phone or a small tablet. I just can't find it now unfortunately. If a company could get that to work well, and it was also robust in the face of day to day wear and tear, being dropped, etc. - and of course it wasn't incredibly expensive - I think they'd probably be on to a bit of a winner.