Then in the end, it will be a catastrophically bad investment - purely from a return perspective.
The question is what is ultimately better in the long run.
If my mother only builds a bungalow for the money and spends the rest, she would have to sell the bungalow in 10-15 years if something bigger needs to be done, or if she needs care, possibly even earlier. That would be an emotional disaster for her.
I actually wanted her to buy an apartment for herself and two small ones for renting, so that she is secure and the money is well invested and thus secured "for all eternity" as far as possible. She didn't want that.
When I look at the interest rates and the stock market, the risk is too high that right after the Corona costs we suffer a crash and settle in the stock market at the level of Japan. That would be too dangerous for her remaining capital. Additionally, the risk of inflation. In my eyes, there is a lot of risk in many areas.
Because of the WKR, she gets no / hardly any credit except KFW alone.
Therefore, for me, it is the best possible solution in the long-term overall concept. Of course, it is clear that we will still go into details with the bank about credit and KFW when we get the plan approved.
Of course, I am grateful and open to better ideas or suggestions.