Maybe as an engineer he should have just cut himself a rectangular piece of cardboard (size 7" / 10" - optional with rounded corners to not harm himself), draw a screen on it and take it into his hand(s).<p>He might have then realized that the size of the bevel, where to put buttons etc are define by nature (except if you have 4 hands or two thumbs on each) - that's what I would call a light bulb moment.<p>His explanations have the smell of someone who profits from the system and tries to justify it at-any-cost even if common sense or "engineering pride" clearly are telling differently.