Each "side" explains its respective point of view on things and ideally even learns something in the process. I myself have described my perspective in the essential context of my own life/living concept, with which I currently feel very comfortable. A reader can draw their own conclusions from this; insofar, I find the informational content in this message lacking and can do little with it:
No hints help; I don't need that because I live in an earth house with 300 cubic meters of volume, or for me it's wasted money.
In my opinion, life in earthen houses is extremely pleasant, even though I do not live that way myself; in fact, I could imagine liking it. Why earthen construction should necessarily become a "bunker" eludes me, because "bunkers" are more associated with the building material concrete, which in turn probably fits better with some single-family homes here. In that respect, earthen construction is precisely the opposite of what was expressed here; ergo, it seems people do not know it themselves. I understood the statement from to mean that it is presented THAT WAY FOR HIM and his living situation and that he still feels comfortable in his house. This neither means that one has to do it the same way nor that it would only be sensible that way. As is often the case, both or many ways are possible if one does not disregard the CONTEXT.
Maybe one should simply read the funding terms of the kfw. I quote:
Why should someone who does not claim funding read this?
For the standard house with standard usage a "must."
I would agree with that as well because in most cases young families are building and similar requirements arise from this. Older applicants, and I count myself among them, can sometimes make decisions for themselves that deviate from the standard, as they only need to orient themselves in their living spaces. For the "usual" family, it is simply inconceivable to live in a house consisting of basically only one large room. I still find it interesting to include these detailed points of view here to get a more comprehensive picture of something. Everyone may still decide freely. I just too often read of a "must" simply because it is sensible or only appears to be so for many. This is also true for underfloor heating, heat pumps, etc., which are generally of course sensible, but a nice house is also possible without that and sometimes even nicer. What matters is that one explains the background of their point of view and does not just present their position as the only possible truth. Not everyone is willing to align their house according to the Kfw.