Why did England, before and after the War of the Scarlet and White Rose, lead an active foreign policy, and the Tokugawa rulers “locked” their country from foreigners – and nothing bad happened for Japan?
The Japanese “locked up” the country with a failure only from Europeans – carriers of a different civilization (just like Europeans-Catholics, they did not allow Muslims to visit them). Moreover, the “constipation” was only ideological – European technology was imported into Japan and successfully mastered there.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.