> But then you have to do the extra step of pressing a separate 'start' button. Why? why do this? Probably some consumer tests showed that people had trouble w

> But then you have to do the extra step of pressing a separate 'start' button. Why? why do this? Probably some consumer tests showed that people had trouble with rotating the knob without pushing it during rotation. Or, pushing the knob sets the time and now you can set the power by further rotating the knob and then pushing start.