We are planning our smart home in the single-family house

There are certainly functions that increase comfort. However, this rarely justifies an additional investment of 30k, but everyone has to decide that for themselves. In the topic of Smart Home, use cases are often constructed that only make sense if nothing changes (e.g., no pets, no small children). And for me, that has nothing to do with "smart." A good example is the vacuum robot that is supposed to start automatically when someone leaves the house. As soon as children leave their shoes in the hallway or pets possibly leave something in the hallway, it no longer works. Constantly making adjustments also means that problems occur from time to time that you wouldn't otherwise have. I imagine that to be pretty annoying. To stay with the comparison to the car: a high-beam assistant that does not work 100% will be turned off after a short time and no longer used.

In the topic of smart home, use cases are often constructed that only make sense if nothing changes (e.g. no pets, no small children). And for me, that has nothing to do with "smart." A good example is the vacuum robot that is supposed to start automatically when someone leaves the house. As soon as children leave their shoes in the hallway or pets possibly leave something in the hallway, it no longer works.
Constantly making adjustments also means that problems occur from time to time that otherwise would not arise. I imagine that to be quite annoying.
To continue the comparison with the car: a high beam assistant that doesn't work 100% will be turned off after a short time and no longer used.

I think this is exactly where the wheat is separated from the chaff. Some give up at the first deviation or the first error. Others then try to find solutions and become creative. Even for exceptions and deviations, you can find clever alternatives in the smart home. Forgotten shoes in the hallway no longer pose an obstacle for my vacuum robot. It reliably recognizes them and drives around. The missed spot is then simply made up for next time...

For all other things, you go with the latest standard, but for the electrical system, you are planning with the status from 1950? For me, that's like controlled residential ventilation - of course, I could ventilate myself. But I don't have to anymore.

Oh dear.

To continue with the car comparison: A high beam assistant that does not work 100% properly is switched off after a short time and no longer used.

To keep with the comparison: Then I simply don’t buy a car from a company that can’t even manage a high beam assistant. And if the car has rust everywhere because no attention was paid at the time of purchase, it certainly isn’t the high beam assistant’s fault.

In general, one should actually have an interest in the topic and want to engage with it. If that’s not the case, every little thing leads to the conclusion that “the whole system is useless.” I once had a KNX project in a very expensive residential complex with 18 units, where KNX and co. came “factory-installed” at purchase, without the option to choose. “Defects” and “problems” occurred exclusively with buyers who had no interest in smart home. It’s always like that.

My uses for switchable/measurable sockets: - Aquarium heater (heats only during the day - photovoltaics) - wardrobe lighting in the closet and living room wall unit and under-cabinet lighting in the kitchen - turning on the TV activates the blinds at windows that would cause glare - towel heater in the bathroom (preheating by time, presence, etc.) - IR ceiling panel in the guest bathroom switchable by wall switch (with appropriate preplanning, of course, it could also be done via a ceiling light outlet) - all chargers in the workshop are connected to a switchable socket. It is turned on by a switch and once charging is complete, it switches off again. - outdoor sockets can be switched off at night and during longer absences or controlled by timers for Christmas outdoor lighting - turning on the PC switches on the monitor, speakers, etc. Regarding ERR and cooling, I can only agree with the reasoning. Set the bathroom to 25°C and the bedroom to 18°C and it works both summer and winter. For the wood stove, I also like to turn down the underfloor heating in the living room beforehand. It’s certainly not wrong that the benefit in a new building is, let’s say, "limited." But already because I wouldn’t want to have a discussion with a potential buyer, who shouldn’t be reading here in the forum, that affects the purchase price.

- Turn on TV, moves the roller shutters on windows that would cause glare

Cool idea, I'll add it to my list.