I think the difference in the Carlson/Buchanan days is the network was doing the CNN-esque thing of having an “array” of figures across the liberal-conservative spectrum because that was just seen as the status quo practice (in the very early days they had both Anne Coulter and Eric Alterman). Rationale being that audiences would see their news programming as a better reflection of the news if all angles were on display.
Now they have the never-Trumper “reasonable” conservatives as a ritual to signify to their
audience that the viewers’ politics are the politics of level-headed consensus. So a shift from “we need to assure audiences of the quality of our reporting” to “we need to assure audiences of their own priors.”

