Very few things are "easier" with touch-screen buttons.
Human need haptic feedback as a confirmation that they are engaging in the right activity, especially while multitasking (e.g.: keeping the eyes on the road while initiating a turn, breaking, or changing lanes).
Initiating turns and using turn signals, similar to turning the wheel or braking, are activities that should require zero fumbling and be part of muscle memory. None of the touch-pad or touch-screen enabled activities in the Tesla pass that test.
Other activities that merit a physical key/latch, and no a stupid touch-screen button (that is subject to relocation between software pushes):
- opening the glove box
- seat heaters
- audio input selection controls
- possibly something else that is escaping my memory right now
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P.S.: Issuing voice commands is not a good substitute for activating functions in a car. Other than the overhead of memorizing the commands (and not confusing them across cars), voice commands are disruptive and undesirable whenever you are on a conference call, or listening to the radio.