@ohm I think you are on to something by focusing on a book with an example project that plays to the new features in Ruby 3. Shoot me an email if it is something you are up to doing. We have short format books as little as 50 pages long.
For working more efficiently and productively in new Scrum teams, I’m going to ask @toddmiller and @RyanRipley what books they recommend. They are the authors of #book-fixing-your-scrum and have another book in the works (too soon to talk about).
For PWA, that gives me a starting point, though I don’t have any connections / people to ask to write on the topic.