Coming to the site from an aggregator (and needing to be convinced to use Ash, rather than coming there directly and already knowing I want to use ash) I found the book a little weird to be so front and center.
I would have really hoped for a small code snippet or screenshot showing how powerful the framework was. And a book a little further down from that would be nice. But "pay to learn" before "here's a quick snippet on why ash is neat" would have made me more excited for this thing I hadn't heard of before, and who's website I was visiting to learn about.
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Seeing a book first gave me a different impression -- like one of the old snooty languages/tools from twenty years ago that was really enterprise-only.
I can tell that's not the vibe Ash is aiming for, but it's what I picked up!
(Somehow, I also couldn't find the documentation link on the first two tries. But that's also my eyes being weird and missing the sticky header where it clearly says Documentation!)
Example: https://vertx.io/