[hot_gril]

The language itself has the issue of there being many separate ways to do equivalent things here. And async/await wasn't in the language until recently, so people got used to the old ways.

I didn't need a book to deal with Javascript concurrency, for example. JS had its event loop as far back as I can remember, but users are getting concurrency via that without really understanding it anyway. It got promises a while back. Async/await is just syntactical sugar on top of promises. There's hardly any other way to do things. NodeJS has extensions for subprocesses and worker threads, but you don't end up there unless you're looking for a way to do parallelism, and even then you can get by with small Stackoverflow examples.