The simple issue. Devices to control the home (taps, light switches, physical locks with keys etc) have a half-life in the decades, while smart control systems have a half-life of about 18 months.
Eg: I have been in this house for 5 years, some of the light switches are 50 years old. They still work. While a friend who renovated their home 5 years ago has had to completely replace their smart home system in that time. They gave up on most of the tech and went back to dumb controls as the maintenance overhead was ridiculous.