Windows are smaller than in the building application/work plan.

There are builders who are hardly ever on the construction site. Not every general contractor appoints a site manager. Who is supposed to be asked.

I agree with you, but I also believe that houses (with the first dry stone walls) have been built since 9500 to 8200 BC, and despite changes it should gradually work out by now.
If you complete a three-year training in your trade and work in the field for years/decades, then nothing impossible is demanded, in my opinion.

Houses nowadays have nothing to do with those from back then. Then there are only 2 house types without changes, then you can expect that everything works and has the appropriate dimensions.

I don't understand. Where are there only two types? Here there aren't really any types, instead you start by asking, what would you like? And why was building different in the past? When I was a student and worked in construction, building wasn't much different than it is now. That was around 1980.

I see the control that only valid plans are worked according to not as "sensible," but as "necessary"; because what use are correctly executed plans "from yesterday"?

It seems to me that some clients and discussants have a naive image of a site manager, as if they were usually permanently present and sat there with a whistle on a high chair like a referee in tennis. Moreover, screed Ahmeds do not earn their money by asking questions, but by raboti raboti. A construction site is staffed only sufficiently for the hard work, i.e., the staffing ratio is only enough, analogous to a nursing home, for food & cleanliness; the role of the green ladies for conversations at the bedside, accompaniment to the hairdresser, reading aloud, and holding hands must be filled by the client themselves. A site manager is not a nice art teacher who instructs the workers in brush handling. Apart from the fact that secondly the proportion of semi-skilled workers is always increasing and firstly most Kurds do not understand Lithuanian at all.

The most prominent example is the BER

Who?

The perhaps someday active airport of Berlin...