In our domain everything is jumbled together in one giant bounded context. Having never done what the author describes I found this chapter very interesting.
I liked the discussion about messaging. I had never thought about messages arriving out of order. I thought the author came up with a very simple solution to what could be a very complicated problem.
I also liked the discussion where he modeled a long running process as an entity and setup trackers to do automatic retries. I had to do something similar with a third party service our application integrates with. The code I wrote was very specific to the one area I was working on though. If you did this type of integration in multiple places in your application, then I could see that having more generic reusable components could be very helpful.