Because they degrade and fail over time. (Plumbing, electrics, windows, roof, damp, etc). But I agree. A roof over your head is important. But that can be either rent or own. And many countries don’t view it as an investment. It’s crazy in the UK and US where there’s an expectation that it will generate equity. (Demand high low supply etc). But I know in parts of Europe for example the price of the house has barely moved in a decade.