Re: "the sudden imposition of subscription fees"
I do have a 'smart' washing machine and it does have two advantages - 1. I can set it to finish when I get home (if I don't know when I'm getting home) 2. It tells me when a load has finished if I'm not the person who loaded it (it's not like I patrol the room to monitor). both stop getting mouldy sheets.
Smart heating is useful in all but the smallest houses. There are some rooms I don't use at certain times. Why heat a bedroom during the day? Why heat the lounge in the morning if going to work. These schedules change far too much for timers (which are often daily/weekly v weekend and the overrides usually need to be manually controlled). Then of course I always forget to switch to holiday mode. A lot of it comes to the ability to centrally control the finer points without wandering around the house.
Properly managed you can significantly reduce your heating bill
...........As a complete co-incidence I actually got a message on my phone when I wrote point 2. Now I get to find out what the girlfriend set washing and then went to sleep.