Folks whose main job is to fill in a specific UI ought to be(come, swiftly) much, much better at using that UI than Joe Average User. Sort of like how prior to

Folks whose main job is to fill in a specific UI ought to be(come, swiftly) much, much better at using that UI than Joe Average User. Sort of like how prior to barcode scanners in cash registers at supermarkets, the person working the till would become familiar using a numeric keypad fast, as well as with the prices of often-bought items.