It depends on the manufacture and if they are using it as a gimmick. Or as actual useful features.

Imagine putting the pot roast in the oven before you leave in the morning. Then activate the oven remotely 30min before you come home. Dinner ready and hot when you get there. Or the oven sending you a notification that one of the heating elements is out. Automatically setting the clock when power goes out and for DST. Notification the stove top was left on when nothing is detected on top. Etc...

Now washer & dryers: Not much extra you can gain from those being hooked to the internet.

Fridge & freezer: Remote monitoring of temperature and notification when temperature falls outside of the acceptable limits. Diagnostic, compressor failure, etc. Door ajar notifications. bulb out and part#. Control ice production.