Those are good points - often we're in different headspaces as well on the matter. Physical product design, mobile app, command line, common entry (like the so

Those are good points - often we're in different headspaces as well on the matter. Physical product design, mobile app, command line, common entry (like the software the waiter uses), pro software (i.e. Photoshop) are all very different aspects of usability representing colliding viewpoints.