> For example the washing machine. You dont need real time information because you know how long it takes since you've done it 1000s of times and it beeps.

It beeps, on the other end of the house (or on another floor), where it's inaudible. (And, thankfully, where the loud sounds of it operating are also inaudible.)

> All these things are just managed in our heads subconsciously.

And when you remove the need to track that in your head, your head gets freed up for other things.

To be explicit, I don't like "smart appliances" that connect to a cloud server. I do like the idea of devices that can connect locally to something like Home Assistant.