There is a strong cultural/religious preference in Japan for newness and renewal. For example, the most sacred Shinto temple, the Ise Shrine, is ritually dismantled and rebuilt from scratch every twenty years.
Those are all examples of building from scratch; not rebuilding, such as after an earthquake or a sinkhole or mudslide... etc
Lack of planning laws, and more generally a government that's trusted and allowed to pay what stuff costs, without endless reviews and standards and low-bid rules that end up costing far more than they save.