Then you get a programmable thermostat that does not connect to the internet and you set it to go cooler at certain hours of the day and you setup a bunch of different modes (normal weekday, weekend, vacation, ...).
Turn on your dishwasher and laundry as you go to work or go to bed.
Tell your kids lock the door.
All of this stuff can be done without an internet connection and should be done without an internet connection. But as soon as someone can hack all of a specific oven, heater, dryer or other appliance people are going to realize they don't want these things connected to the internet. Especially because huge sections of commercial companies don't worry about securing internet devices at the moment, and I doubt they are going to change that anytime soon. It may be naive to ask why someone would want this ability, but when you look at the most popular passwords used and other security indicators like that, it may be more important to ask should people have this ability?