It is quite a complex topic. In addition, there are other factors such as the potential future governmental access to real estate in the form of a forced mortgage for property owners. This has happened before in Germany (Lastenausgleichsgesetz) and has also been discussed in the Bundestag.
The Euro crisis is not over yet, the worst is yet to come. A look at the so-called Target2 balances is enough. These are alarming figures.
I do not really trust our state and Europe in such matters, and homeowners can hardly defend themselves.
Moreover, a house also ties up a considerable amount of capital. With long-term investment in broadly diversified index funds, more capital can be accumulated than with a house that requires its first repairs after just 20 years.
Owning a house is a fine thing. However, many overextend themselves financially or often cannot build other retirement provisions for financial reasons. And living rent-free is not really the case even in a house that has been paid off. Costs always arise, which can be better managed. But many postpone this until a major backlog of renovations occurs.