I hope the author at some point adds the section on ConfigureAwait. I've seen code bases where the devs have added .ConfigureAwait(false) to all invokations "just to make sure".
In an event loop model, I've never felt the need to reach for ConfigureAwait(false). Maybe there's certain operations that could be sped up a bit by letting them resume on any thread, but generally I want to be sure that the event loop is executing my code. There wouldn't be much of a point to using an event loop if nothing ever returned back to executing on it.