There definitely needs to be an option to continue to include the normal progress list in the output.  This is essential for comparing test runs.  I'm +0 on whether it be the default or not.  Actually, what is really needed for automated analysis of test runs is getting the complete output of a regrtest run in a standard serialized format, perhaps YAML, including the test name, test result, stdout, and stderr for each test. But that's a separate issue.  I've attached a the output from a current OS X run with the proof-of-concept patch.  One issue that I see is that there are a number of tests that normally produce messages of various sorts to stderr and/or stdout without the test failing.  Suppressing the passed test names makes it difficult to figure out from which tests these messages are coming from.