I saw a fridge that had an app so you could control it from anywhere.
My requirements for a fridge are remarkably simple, to the point the only practical use I could think of an app was alarm that I'd left the door open or something.
(If this particular app did have a door-open alarm, it wasn't on the list of features. It did say you could adjust the temperature from your office. A location I'm often worrying about the fridge.)
The thing is that turn on remotely is useless, it requires that you've added soap, closed the dishwasher and that it's turned on. At that point you might as well just set a timer.
There are two features I could see being useful: Auto-start during the night, when the electricity cost is lowest and a detailed error report, like heating element is 100% function, or water is leaking. None of those features will ever be available, because that's not why they are adding "smart" features.
They typically have a very powerful 2.5 kilowatt heater they run in bursts - for like 5 mins when prewashing, for like 10 mins when starting the main wash, and like 10 mins again when drying.
In between those times, the machine uses only ~60 watts for pumps.
I have often pondered what a world of machines designed to meet solar output looked like - and for a dishwasher it would involve the heater being modulated to match the solar output (and knowing that sometimes the wash cycle would take longer if a cloud was overhead so heating was delayed by a half hour).
Concrete costs far fewer $$$'s than batteries do, per kwh of heat stored, it also doesn't require inverters, balancing or safety systems, ad lasts millions of cycles rather than thousands.