Which floors are suitable for single-family homes? What does the home-building elite recommend?

I am only sure that such spots become more susceptible, for example, to moisture, that they swell up.

There is no need to worry about that. A wooden floor gets care from time to time, nothing swells up. Not even in the kitchen area. I understand the choice for vinyl in connection with the concern and the feel when walking.

I cannot understand discussions about the allegedly harmful properties, etc.

In every store that sells these floors, there is an immediate smell. This subjective experience alone is enough for me to decide against it. Then I don’t need to deal with measured values anymore. Others don’t want wood because they don’t trust this material (swelling, for example). I find both very understandable. We are humans and like to imagine we act rationally.

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In every store that sells these floors, it smells the same.
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It also smells at the cheese counter ... :D

My wife is really very (!) sensitive when it comes to smells. However, she did not notice any unpleasant odor from our vinyl flooring in the bedrooms.

No need to worry about that. A wooden floor is cared for from time to time, it does not swell. Not even in the kitchen area. I understand the choice of vinyl in connection with concerns and the feel underfoot.

Wooden flooring is just as possible in the bathroom. People often tend to exaggerate in their minds when they imagine flooded bathrooms, constantly wet floors, also in the kitchen. We had a solid wood floor for 30 years and I wouldn’t know what could have ever been wrong with it. After 30 years, I have seen other floors, always visually completely out of style and also rather unattractive; most of the time the floors had already been replaced twice. Wood is a pure natural building material; scratches or dents in the wood are completely no problem if you perceive the material as what it is, namely nature. I personally choose nature and live with it or I enjoy the respective properties, or if I don’t like it in certain places, then I simply avoid using a natural material altogether and don’t buy anything that only looks a bit like nature. Looking like nature but rejecting its properties would be a lazy compromise for me. Nowadays, you see more and more surface “refinements” that deliberately make wood look old or heavily used, which is then called vintage or something similar, often at a correspondingly high price. It is supposed to look old or used, but must not actually be so... hmm... maybe that’s why I have less affinity with terms like vintage etc.

Ground floor: Tiles
Upper floor: Parquet
Attic: 3 rooms (bathroom, storage room, hallway and bedroom), bathroom + storage room = tiles, bedroom and hallway = parquet

As far as warmth is concerned, nothing beats real wood .....

Except for the entrance area, I have parquet flooring everywhere, including in the kitchen and bathroom. It works really well and feels good underfoot. Since it is multi-layer parquet, it is also suitable for underfloor heating. If financially possible, I wouldn’t lay anything else. And it ages along with you. A wooden floor gets more beautiful over the years.

It also stinks at the cheese counter ... :D

I wouldn't choose it as flooring either... :D