You probably want your washing machine to finish when you'll be ready to take the clothes out, rather than leave them sitting damp in the machine.

There should be plenty of opportunity to load shift with other things though, a dishwasher as you mentioned, or a fridge or a storage heater or a charger for your electric car. All can be done with minimal inconvenience to the user.

> leave them sitting damp in the machine.

Rinse hold solves this. Even the cheapest machines have it.