Lots of appliances have actual use cases for WiFi. A Fridge for example makes a loud beep if you forgot to close the door and the temperature is too high. But forget the door and leave your house, and you won't hear the beep. A push notification would solve it.

One can argue whether such a feature is actually worth having in a fridge (Added costs, security risks, complexity...) But at least it has a valid use case: notification.

I just can't imagine a dishwasher having such a use case. Notification for when it's done isn't useful. If I'm not home it makes no difference that it's done, and if I am home it could just beep. Starting it obviously isn't useful either. So what features does wifi offer in a dishwasher? The best I can think of is... Error diagnostics (So I don't have to google "E5" when the flood sensor triggers). But that doesn't seem like enough of a feature to warrant a wifi connection.