I've often had the local test runner say everything is fine, only to be surprised with a massive test report.
The test report uncovers things the log from the game does not mention, nor the test runner. So you're basically working in the blind when you try your best to fix the issues.
You can only guess, resubmit, and in a few days (or some times weeks) you will get a new report only to see the issue persists, or even worse, there is a new issue with the assets you tried to correct.
The test runner has become more advanced, and I'm happy to see that, but it does not show the full picture, and it is both frustrating and confusing.