This heuristic would essentially lead one to believe that independent-mindedness is largely not possible would it not (the explicit "probabilistic" claim in the conclusion)?
I meant it in a more technical sense, as in “I start my morning by checking 4-5 news outlets from different corners of the political field and try to figure out what’s really going on by comparing the narratives”. That of course is not sufficient; one has to do their homework on prior history of whatever the contentious issue is.
And yes, probably it’s not an activity most people engage in.
That is certainly a fine practice, but my disagreement is with the claim that doing this is necessary for open-mindedness, and that those who do not are "probably" doing something highly silly.
There was a website aimed at something similar called “the factual” but they never really got the algorithm off the ground before they were bought - by yahoo news by all things.
And yes, probably it’s not an activity most people engage in.