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How is reaching for the commander knob any better than reaching for the touch screen? To me it's worse, because it takes longer to access something via Mazda's knob and menu system than it does using most of the touch screen systems on the market. And you still have to look at the screen while you're doing it.
IMO, Mazda's system is a misguided attempt to copy a "luxury" feature that originated with BMW, Audi, et al before modern touch screen interfaces were introduced, and has been obsolete for about 10 years now.
Having Idrive for the last 6 years I have learned all the commands without looking at the knob. The advantage is that your not poking at the screen taking your eyes off the road. Example you need to tap the screen 3 times to dig into a specific menu with your eyes staring at each poke. Not to mention the delays between pokes. Memorizing the (Idrive) command knob and buttons I can go through multiple screens without looking at the screen until I am done. Funny thing is the new BMWs now have both options.