[BackBlast]

It seems to me that you are comparing apples and oranges. If your code has no relevant state or coupling, a pure function. Sure, you can look at it in isolation. You could do the same in a monolith.

I've worked on plenty of monoliths with async style code and have found the stack traces to be plenty helpful. It's never been an issue. At least in JavaScript you retain all relevant scoped data and can dump it all if you like. Debugging gets much more interesting when there are no obvious such errors, yet error conditions are present.

I'm still not seeing any equivalent microservice tooling.