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.
I have a friend who will say things like “I have to go at 3” and get up at 3 on the dot without even looking at her watch/phone. I’m not that guy and I need buzzers, timers, and ambient displays all working together anything done at a time.
That’s certainly true for some people, and I envy them. Others of us can easily forget the washing machine was on and needs emptying for anything up to three or four days, running it each day before promptly forgetting to empty it before it needs doing again.