I agree that the effectiveness is quite surprising, given the simplicity of the analysis. It can go very wrong, however, if a significant negation is overlooked

I agree that the effectiveness is quite surprising, given the simplicity of the analysis. It can go very wrong, however, if a significant negation is overlooked, as in cautionary tales: ... So, don't do what the late Thag Simmons did... Maybe final paragraphs should be more highly weighted? That's often where the conclusion is.