Author of the book here — 100%. The idea is to release early and update on the go. You might wonder if it's worth delving into the book in its current, unfinished form. I'd say it depends.

There's quite a bit of content around general DE knowledge. However, the anticipated design patterns are still in the works. Suppose that's what you're most excited about. In that case, you'll find the beginnings of exploring the patterns of `caching` and `ad-hoc querying` in the first Convergent Evolution chapter, but otherwise, you need to wait for more.