That's not always the right way to go either. A professional using a particular device on the daily will be proficient in its usage regardless of how terrible the user interface, simply on the basis of how often they use the thing. On the other hand, how quickly an amateur can pick up a device and start using it will be heavily dependent on how intuitive and instructive the interface is. These two can often be conflicting, though not always. For a product that has a lot of "amateur" users (many home appliances), a touch screen can often be the right paradigm to choose.A classic example of this is the situation where an experienced cashier on an "analog" system can just fly through the buttons and complete transactions in no time, while at the same time a rookie would take that much more time to ramp up, figure out, and internalize the various button mappings. A darker interpretation of this would be that the system is optimization for fungible workers, where swapping out one cashier at will for another has negligible impact on productivity.
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