We have though. For example for lights, zwave implants near switches work great. If the whole system goes down, they still work as normal switches. No "switch you can't turn off" effect either. It's just not the default way people go - especially if they're renting. It's much cheaper to buy a crappy wifi lightbulb if you want one. And then you want more...
However you quickly realise that's logical, as otherwise you'd need a second cable, or to embed it in the tube somehow.
What's less defensible is not duplicating the +/- buttons on the vacuum itself, so if the coin cell battery fails you can only turn it on and off.
A dryer which blocks the start until I open and close the doors while it's turned on (doing it while off doesn't work).
A washer which checks the "start" button multiple times, so if you press it too lightly, the panel changes to "running" state but the washing doesn't start. (Known issues, won't be solved)
I'll recommend not getting Miele any day.
All you really need are some valve actuators, timing relays, regular relays, a couple rotary switches, a water level switch, and contactors for the motor.
You need the valve actuators, water level switch, and motor contactors/controller anyways if you’re doing digital control, I’d rather have relays with a lifetime of 10 million actuations handle the very simple logic.
In particular communication between doctors and nurses is worse, because it’s all mediated by software
By 2020 I figured out that digital stuff is worse in UX and recalled that story with a sigh.
The change in my head happened, I think, in 2013, when I tried to count pedestrians on streets, and found out that the digital way (OpenCV coding, training, etc.) it would take way more time, than just plain going outdoors and counting. I also noticed that simple watch on my arm was much better than a timer with alarm in a phone -- an order of magnitude less hassle.
So by 2020 I checked every appliance, that it has no Internet, nor IoT in it. Needless to say about vacuum cleaner (even the robotic one), washer, etc. Want a light that has variable brightness for evening, going to bed, or cloudy day? Put a 2-switch lamp on the ceiling, and a small one near the bed. Want to turn it on in different places? Passing switches -- they just need some planning ahead and wires.