Not only do more bugs reproduce in staging than locally (for obvious reasons), but mirrord also saves you the trouble of figuring out how to run your stuff locally in the first place. Previously, before you could add a single line of code to your microservice, you had to be able to run it and all of its dependencies on your local machine. This is such a huge challenge in some cases that people actually prefer to git push and deploy to the cloud for every little change. With mirrord you can just clone the repo and debug.