I’ve always found Idea does a very good job of figuring out the right suggestions, and keeps getting better all the time.
But definitely use what makes you happiest, and most productive. There’s no shortage of tools to choose from in our industry. All of them with objective pros/cons, and subjective pros/cons.
Really enjoying the design ideas I’m gaining from the book. Also having ‘fun’ with Kotlin, as unfortunately, I don’t get to use it in my day job anymore 
Working through the early days of the book ‘forced’ me to dig into the inner workings, and code samples. Nothing like digging in to truly learn, and understand the design, and process.
But constructive feedback. Hopefully the technical reviewers will get the examples, and sample code, better working than it was in the early days, or else it will cause a number of people to give up way too early.
I see the source code as a zip. I searched, but didn’t find a repo on Github. Is there a publicly available repo with the source code? I ask as it makes determining what has changed so much easier, and I like to see the evolution. Completely understand if you don’t want to share it, though.
Thanks again, and keep up the good work. I really appreciate it when people take the time to share their ideas.