1. Hands are dirty/unavailable (like other mentioned cooking) 2. The physical controls are physically across the room 3. The physical controls can't be located

1. Hands are dirty/unavailable (like other mentioned cooking) 2. The physical controls are physically across the room 3. The physical controls can't be located easily (lost remote, dark room) Another point, the cognitive load of speaking a command is different than pecking through menus on a phone or finding the right button on the remote/device. It may be easier to just speak out load depending on your state if mind.