At some point in time, if we ever want to move past, “hear-say”, when it comes to broader impacts, we have to start treating broader impacts just like any other field and profession.
This means to hold ourselves accountable to a professional standard and stop with the anecdotal evidence and look at all of the data/facts and conduct rigorous research.
Once we begin to do those things we can then start to develop appropriate answers to questions that have been asked concerning broader impacts. I guess those are my two cents.
If you are interested in reading more about research and evidence-based approach to broader impacts click the link below.