Great interview.
Mr. Berkes constantly used his fingernail. I have an old Fujitsu LifeBook B-142 touchscreen.  I use my fingernail also constantly.
WE DON'T NEED all those buttons on the perimeter of the screen.
One button needed: ON-OFF.
For controls use the screen, it is a touch screen !!!!!
Make the unit as big as the screen !!! The next generation that he shows at the start of the interview is what they should have developed.