My main problem with (jvm) stack traces is that they generally don't include information about the values that are passed to the function calls, so you get the structure of the code, but not the actual value that could help you reproduce the error. I know that once you deal with relatively complex objects that are not trivially serializable you get an address, which is not super useful, but in some codebases / problem areas you still could be getting a lot of information that gets lost due to that design decision.