Also - move the tech forwards! Buttons can be cool. Software controlled detents for rotary encoder knobs, back lit stream deck style buttons, cool knobs that combine twisting and pulling in/out.

1. Drives me crazy on iPhone. On Android there is one button to go back. Very simple. On iPhone sometimes it's top left, some times it's called 'done'. Sometimes the app doesn't have it at all and I have to use a menu instead.