And I do wonder about sample size.
Sample size is CRITICAL. People always think that they figure something out from looking at the world--but you just can't. I could know 5 people with DEs and all 5 could have problems and it could mean nothing. You have to have a large sample to be able to make any judgments about trends.
This is why (I hate to say it) we can't learn very much if X person tells us what worked for her. We can try new stuff and hope to get lucky. But we are always lacking data.
Generally, there is a lack of data--which is why we tend to make these judgments. It's only natural, I'm not knocking us.