“All anecdote and no data”
That’s a criticism, of course. A report, study or testimony that’s all anecdote with no data carries little in the way of actionable information.
On the other hand, if you want to change people’s minds, “all data and no anecdote” isn’t going to get you very far.
We act on what we understand, we understand what fits into our worldview and we remember what we act on.