It's a good thing personal choice exists and you don't make the rules for everyone.

> I don't see any reason someone would want to turn it on and off based on presence.

Maybe someone doesn't want the noise when they are present? Some people like white noise, some don't.

> The amount of electricity these take to run isn't worth even mentioning.

Not everyone lives where you do and pays the electricity rates you do. What about people who generate their own electricity, live off a grid, or just plain want to conserve energy for a myriad a reasons? Turning off specific loads based on XYZ is useful.

> So you can refill it remotely? You have to be present to fill it anyway - just look at the thing and you'll know its water level

Maybe the humidifier is in a low visible or less-trafficked area, and getting a reminder to fill it up would be useful.

What a terrible take you have on people's use case not exactly matching yours.