Situation in the real estate market... madness

How you come to think that an average family could not afford an inexpensive rental apartment escapes my knowledge.

Because that emerges from the adjustment of my calculation! I compared the owner with a tenant and considered an average rent in the rental price – so a significantly lower housing value than the comparable house. If I were to take the rent from, for example, Düsseldorf, where new buildings cost on average 15€ or existing buildings about 10-12€, the burden for the tenant is identical to that of the owner. And he is living paycheck to paycheck. Your words. My calculation with your numbers.

Bookstar, free yourself from your compulsions. Then your world might not be so narrow anymore.

Compulsions? I couldn't care less how you live. But you are participating in a discussion that is based on the average equity and homebuyers. And your carrot with 15 years on its back is simply not an average car, at least not in Germany.

Whoever has a nice home also drives a sensible car

In my perception, this is not the case. I am mostly on the road in RLP, Hessen, and NRW (across all municipality sizes from just above tiny villages to just below large cities), and I did not invent the worn-out Mondeo estate behind the woodgrain sectional double gate that I like to quote, but have often seen it almost as a running gag.

Compulsions? I don't care how you live.

So far, there is not much sign of that.
More like "can't do" "unreasonable" "whoever has a house has proper cars".
That's quite a lot of "must" and I call that (social?) compulsion.

But you are participating in a discussion that is based on the average equity and house buyer

Not really.
I responded to Farilo's post, in which he wrote a sample household budget book. Included in it, based on the supposedly typical homebuilder with 4-6k net per month, were €1000 or up to 25% for vehicles. Yes, if you make such assumptions, then such a household calculation looks tight to impossible. Whoever earns 4k and spends 1k of that already on cars will hardly be able to buy a single-family house.
I then wrote my own numbers, which are significantly different.

Otherwise, I have not read anything about averages here so far. At best assumptions about what is allegedly average.
Like your link, which provides €250 per year for car maintenance. That is about 30 car washes per year. I might come to about four per car, but then I am probably not average. Doesn't matter. If I had a new car, I might wash it more often. Also not included is comprehensive insurance.

And your carrot with 15 years on its back is simply not an average car, at least not in Germany

Both 10 and thus, seriously, just above the German average (9,x as far as I know).

By the way, a brand-new Corsa costs about €120 per month to lease (10000/3/0).
Currently at Sixt Leasing, a Polo GTI for €100 per month.
But presumably, those are also not real cars. Whoever has a house and doesn’t roll the 5km to work in an A6 is probably low-class or something.

By the way, I also once had a Skoda Octavia in mind as a family wagon. TSI was ruled out because of timing chain issues, diesel lacks the mileage here, and in hindsight, you can probably be glad to have thrown it out of the selection.

What about our Twingo? Is it allowed in the new housing estate? Oh, Astrid next door has a Hyundai 10. And F. at the corner drives an old Polo. Don’t we take the topic of cars seriously here? Too often they have to stand outside, even at night, because the garages are either missing or full of [Tüdelüüd]. The lawnmower is also less rust-protected, it has to be inside. Are we doing everything wrong?

I observe that people who find meaning in consumption (for whatever reason) have a hard time with people for whom consumption means less. Now, a house is not a consumer good and can – depending on the location – still cost half a million plus even for people who are not interested in cars, expensive food, or 4+* hotels. That’s why not more is spent on stuff like cars, food, vacations, fashion, etc. Those who find fulfillment in what they do don’t give a damn about such consumer ideas; they are already satisfied. People who do not share this to the same extent often can’t imagine that beyond a certain income level, things don’t have to be bigger, better, more expensive, or more. Especially not when you want a house.