Touchscreens are more intuitive than function keys. Operators can quickly see what needs to be done, and then instinctively touch the screen to initiate an action.
Now your project can include pushbuttons, Increment/decrement buttons, and a pop-up numeric keypad:
You can even enter text with the Text Entry object:
Text Entry on 3" panels:
Text Entry on larger panels:
The 3" model is available with or without a touchscreen.
All other models include touchscreens.