Sony’s Concord might be the biggest entertainment failure of all time, so why wasn’t it news?
That’s the reader’s job. There are other articles that cover Concord and Concord’s flop in detail. Those topics have their place and it’s not in the meta discussion about the meta topic, by definition. Having to do the reader’s job of staying informed on a topic in articles about the meta discussion would prevent the discussion of the meta topic. Which is the goal of your argument.
In other words, your argument is intended to silence criticism of the mainstream media under the guise of imposing a moral value, incorrectly as it stands. If we followed your argument we would be unable to discuss anything because every discussion would have to have the context of what came before. What your argument calls for is lazy. If a reader wants to participate in discussions they have to take the time to get informed.
The only rich argument here is yours, trying to call journalists lazy for doing their jobs.