You obviously haven’t used systems like Alphred, where this functionality is present. When you doing something and you want a quick calculation done, it’s a lot quicker to just double tap the left ctrl key and type in “5*20” and press enter to see the result. Alternative is to double tap ctrl, type the name of calc, enter, then type in your calculation and enter, then close the app. a lot more steps just to get a quick answer.
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