On the other hand, most backyard sheds don't use materials that take 300-500 years to produce. Well, except the petro-plastics...

As the article notes, but for the war the surrounding forest is tended and maintained just for that purpose.

no, it's just that particular shrine... Ise Shrine.

https://theprepared.org/features-feed/ise-jingu-and-the-pyra....

80,000 is number of shrine in the entire region.