Cars.

Cars are ubiquitous. They are everywhere. We all relate to them without thinking. Cars run on batteries. Even IC runs various systems using battery power when parked. But do cars have an off switch? To turn them truly off, such as when storing for a long period, the procedure is take a wrench and physically disconnect the 12v battery. So I disagree with the author. At least some battery-powered products are doing perfectly well without off switches.

Other IC vehicles, notably aircraft, do have true off switches that fully shut electrical power at the source. So it isn't anything inherent to IC technology. Consumers have spoken: some things do not need off switches.