> The less moving parts the less chance of failure, right? Of failure by impact and vibration, perhaps. But that's pretty much a solved problem in car dials an

> The less moving parts the less chance of failure, right? Of failure by impact and vibration, perhaps. But that's pretty much a solved problem in car dials and buttons - we have decades ols cars with fully functional dashboards and controls. Otherwise, risk of failure is driven up by complexity, in which case a computer, with all its components, plus an operating system, drivers, etc, and apps on top of it add many layers of complexity in comparison with buttons and dials.