I have to say that I've just watched the video and I'm still surprised by how some people get confused by promises. If you forget to handle an asynchronous err

I have to say that I've just watched the video and I'm still surprised by how some people get confused by promises. If you forget to handle an asynchronous error in Node.js by default it will silently fail (forget to check err in (err, data)). If something throws synchronously the process will crash so if I find an endpoint that does a `JSON.parse` in your server and pass it invalid JSON - I can easily do a DoS. With promises, you drop the incorrect assumption that operational === asynchronous and acknowledge that things like `JSON.parse` can cause "operational" errors too (and asynchronous errors can be caused from programmer errors). With promises, both synchronous and asynchronous operational errors are handled in the same way - nothing is swallowed and everything is reported. Except for extreme edge cases you get your core dumps - and debuggability is actually much much better because you have real stack traces and errors.