Not every country works the same, coming from a place with low home ownership (40%, mostly in countryside).
Some ideas of what can be different:
- lower flexibility (non liquid and concentrated investment)
- many people will end up with majority of their savings in real estate instead of more productive part of the economy (companies, etc.)
- might discourage people from seeking opportunities elsewhere if there's a high cost of selling/buying houses
- in cities institutional owners (here a lot of buildings are owned by pension funds) can take a better care of multi family buildings (compared to a fragmented ownership where some owners might block even value preserving investment), it's also easier to mandate policies (e.g. better isolation, etc) for those institutional owners