If you have solar panels you can turn on appliances or compute intensive tasks if they produce power.

If you have humidity problems, an alarm can remind you if aerating makes sense. If you additionally have a bad landlord you can prove you aerated three times per day and still mold did grow, so he has to fix something!

If you have a home theatre one button can dim the lights, turn on the TV, and close the blinds.

You can have your motion controlled floor lights only turn on red in the night.

Small things which are in total useful.

With HomeAssistant its easy to do without any cloud connection.