How expensive was your conscription / hidden costs?

With an electric opener, it is also possible to open it without a key, especially if you want to go in yourself. I don’t like constantly carrying a bunch of keys in my pocket.

I am at work, the child is at the door and has forgotten the key. Rings the bell, I see the junior on the camera and can open. I am on vacation, my package was delivered to the neighbor but he did not realize that we are not home. Door opened briefly, placed down, thanks. The cleaning help is coming a bit later today, but I have to go to an important appointment, she rings, I open from a distance. Forgot the key. Just to name a few use cases.

Everyone has to decide that for themselves. Preaching a life in the past as a societal standard does not bring about any innovations.

I can’t quite grasp the situation...

Neither can we - and I already hinted to you in your garage thread that your approach is inefficient.
My advice would therefore be to start a new thread
1. with the completed questionnaire and
2. a representation of the property (cadastre extract, preferably also with elevation points or similar).
Then people can help you much better, to put the cart before the horse.

I have received a first offer from a prefabricated house provider.
I understand that the price won’t stay at that.
Where did additional costs come up for you afterwards and in what amounts?

The passive comparison of the construction service description is a tedious ordeal. It is decidedly better to actively define what you want (which your architect does in service phase 6). A good tender pays off, i.e., "costs" less than it brings. When you have described your project to us, we can see what the sensible planning effort is in your individual case. Externally (and therefore to be googled with the quotation marks since it cannot be linked here unfortunately) you can read in “A house building roadmap, also for you: the HOAI phase model!” how to proceed most cleverly in planning. And if you have money to spare and want to "save" the architect during the tender, there are also professional construction description readers. I am one of them, but there are many.

How did you actually request the offer, and with which selection of providers (and how did you find them)?
There is a section here "Experiences with construction companies", where companies in basically every region in Germany are discussed.

(...)
You probably also have a bunch of stuff that I would say nobody needs.

Yeah. Intelligence, for example. Is that what you meant?

Here's another nice scenario. You get hacked and the insurance pays nothing because there are no signs of forced entry. Or the thing opens by itself, like the trunk of the 3 Series F31 in some models...

Not all technology is good, especially when laymen set it up who have no clue about IT security.

I am at work, the child is standing at the door and has forgotten the key. Rings the bell, I see the junior through the camera and can open. I am on vacation, my package was delivered to the neighbor but he did not realize that we are not here. Door briefly opened, package placed, thanks. The cleaning help arrives a bit later today, but I have to go to an important appointment, she rings, I open remotely. Key forgotten. Just to name a few use cases.

Everyone has to decide that for themselves. Preaching a life in the past as a societal standard does not bring forth innovations.

I would have liked your post as an example of individuality, if you had not qualified the alternatives as "life from yesterday."

Solving problems through technology that wouldn’t have even arisen is also not exactly the standard of today.

Letting your own children suffer the consequences of forgetting the key can also be interpreted positively as meaningful education. My cleaning help has been with us for longer and has her own key. And vacation is the time when my home is not supposed to bother me – not at all.

Best regards from yesterday and no offense ;)