Convenience is the primary benefit. For example, my bedroom light is on a smart switch. I can have the light on when I get into bed, then just tell my smart assistant to turn it off. Of course I could just put a lamp next to my bed, but I find the Smart switch to be easier. I also use the Smart switch to automatically turn on my lights in the morning when my alarm goes off to make it easier to wake up.
Some people use Smart switches to turn the lights on and off in the house while they are out of town to make it look like they are still home.
While the devices do you use some power even when they’re turned off, this is a very tiny amount, and is almost certainly offset by reducing the amount of time the lights are actually on. I’m sure we’ve all been in a situation where you sit down to do something and realize you left a light on in another room. Some people will get up right away and go turn it off, but people aren’t inherently lazy. If you can turn the light off by just asking your smart assistant that people are more likely to do it. Having that light bulb run for a few minutes last each week we’ll save more power than the device is consuming.
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