You can keep your hands on the keyboard. Some people find having to move them away from their usual home place breaks their flow.

Sure there are things like an Elgato StreamDeck that you can do similar things with but they still require you to move a hand from the keyboard.

I suppose it is similar to using voice control things like Alexa. Setting a timer by hand in the kitchen isn’t exactly hard but it is so much more convenient to do it by voice if your hands are covered in raw chicken juice or the like.