Have you seen new rent prices right now? It's definitely not "extremely cheap". It's only extremely cheap for those in grandfathered contracts.
So you’d be better off renting and investing the deposit, the stamp duty, notary costs and the 2000€ you save each month in government bonds.
https://www.numbeo.com/property-investment/rankings.jsp
The ROI absolutely does not make sense but it's real. A large portion of the world believe that the only two investment classes are real estate and government bonds.
We would be all better off if people invested in the stock market instead of “investing” in properties (including landlords)
Then, who builds the new apartments that people rent? If 50% of people in Germany rent and there is no ROI from building for rent, then who finances the new buildings??
People are overly obsessed with home ownership and being free and clear as soon as possible so they blindly repeat adages like "paying the landlord's rent" and "flushing your money away" without running the numbers.
Would you buy an apartment in Taipei, where a $1M apartment rents for $1k a month? I'd gladly pay my landlord's mortgage in that case.
It all depends on interest rates, rent to price ratio, and opportunity cost.
The rest of the country is a suburban wasteland
Most people in Germany don’t buy the apartments they live in, because renting in Germany gives you more or less the same rights as owning a leasehold flat in the UK. If you really want to buy a flat, tax-wise it is more convenient to rent it out and rent another one to live in.
In many cities there are rent control mechanisms that make renting extremely cheaper than buying.