A minor question occurred to me. I know we know that since Japan never went isolationists, a lot of Japanese clans are more mercantile and very rich with connections to European merchants, and the study of Yōgaku is prevalent. You also mentioned that the Tea Ceremony is still an important part of culture and even politics.
So, I read that Oda Nobunaga (And a lot of Sengoku Era Daimyo) had a hobby of collecting Tea Utensils, launching a meibutsu-gari to collect rare Chinese and Japanese tea utensils and other famous objects.
OTL, He tried to acquire a piece Ranjatai wood, tried to get all three Narashiba Katatsuki (He only got two before he died) and my personal favorite story, he tried to get the Hiragumo from Matsunaga Hisahide, but he famously destroyed it to spite him (Though, one story says Hiragumo still exists and is housed in Hamanako Kanzanji Art Museum in Hamamatsu). Nobunaga also liked to collect things from the West, like suits of armor, clothing, weapons, clocks, etc. (Also, a lot of Daimyo did this as well)
So, is meibutsu-gari still somewhat practiced? Do Daimyo still actively go out their way to collect rare and luxury items all over Japan, and trade amongst one another with these collector's items? Maybe even extending to European, Middle Eastern and other Asian items such carpets, rare books and texts, paintings.
Or in short, are Oda Clan and other Daimyo clans are just massive collectors that do some personal trading amongst one another in diplomatic settings (Or the equivalent Samurai NFTs, just more useful and way more valuable)
Sidenote, speaking of those items, if they do, what rare items do the Oda Clan own? Did they ever acquire all three Narashiba Katatsuki, or even Hiragumo (If the story about it not being actually destroyed is true), or even own famous Japanese swords, like certain Muramasas and Masamunes?