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Here's a 1200-yr old wooden church: https://en.wikipedia.org/wiki/Greensted_Church

Protected from fungus (rot) and insects, wood can last indefinitely. How to achieve that, of course, varies widely.

Wood, if properly taken care of and kept dry, will last basically forever. I’d imagine they do that in Japan because of humidity or so.

They do it in Japan because they choose to. Rebuilding it every generation is a religious ritual tied closely to Shintoism. The buildings certainly aren't rotting out completely over that short timeframe!

Many Americans live in wooden houses that are much older than that. The biggest problem tends to be termites.

There are still some 12th century wooden churches in Norway that still have most of the original wood: https://en.wikipedia.org/wiki/Stave_church#Old_stave_churche...

Only one temple in Japan is continuously rebuilt. Many others are several centuries old.