The answer would be rigor. A huge problem with sociology is the dependence on the story. Unfortunately, since the sociologist is often a human with their own biases, they are going to see what they want to see.
For example, I purchased the Kindle version of the book the author recommends ("Coming Up Short"). I turned to the appendix, where the author describes her research methodology. And sure enough, the research involves open-ended questions ("Walk me through a typical day at work." "Is there a time you lost a job? Could you describe it?") that could lead the interviewee to respond in any way they want.
There are many problems with this, such as : 1) the interviewee may inadvertently invent convenient narratives that provide comfort but aren't accurate, 2) the interviewer may mis-interpret the answers, etc.
How are we supposed to develop policy off of this? Sure, it's a great starting point for starting research, but the narrative- or story-based approach should never be the conclusion.
This is why economics is so much more trusted. Although economics has flaws, and the study of econometrics can sometimes lead to incorrect conclusions, it at least uses objective data and metrics, which are less susceptible to error, providing a much more grounded approach to policy decisions.