Although some (most) of the information is available online (library docs, blog posts, github discussions, twitter tweets) this book is a nice and structured summary on the state of micro-state management in 2022. Kudos to Daishi Kato -- I've been following him and his state libraries' work for some time now!
My only gripe is with the book publisher -- this book really needs an additional editing pass or two given the fact that the author is not a native English speaker.