This old saying has some relevance in the world of home inspection.  It means you shouldn’t get rid of something valuable while getting rid of something worthless.  It’s a problem for home inspectors, because if we make one little mistake in our report, it throws our whole credibility into question.  People often dismiss an entire inspection report because of one error.  It’s not necessarily fair, but people wonder where else you messed up.  We need to be really careful, and we need to stay within our scope when writing reports to reduce the risk of errors.