[emestifs]

Thanks for the reply. It was a good read. And I can agree on the points from experience.

One suggestion/correction: "Your only way to track message flow is with extensive and expressive logging.", you can do distributed tracing. It not a silver bullet, nor does it replace a proper debugger, but it's better than following logs. You can use a number of distributed tracing SaaS's, but you still have to do at least some manual instrumentation in your code to add additional info.