My dad once said to me, "You give a lot of books three stars." I do.
I am not a minimalist at all. You know Howl's bedroom from Howl's Moving Castle? That's more my aesthetic. But I like reading about people who make minimalism work for them. I don't remember the book that well, but the impression I have is that minimalism made Sasaki happy, and he wants to share that with people (but not in a pushy, obnoxious, holier-than-thou type of way).