Usually, no. Noibu has a collection of tracking and debugging tools that provide many of the same insights that come from error reproduction, so a developer can investigate a JavaScript error without reproducing it.
By examining an issue's Stacktrace, a developer can see the line of code and the path to the file that is causing the underlying problem. They can also see the function calls that resulted in that line of code.
If there is no Stacktrace it may be necessary to reproduce the error. Learn how to investigate an issue when No JavaScript File is Detected.
Before reproducing an error, check out our Process Guide on Replicating Issues with Noibu.