The point still stands that US news channels still preach to the converted. Nobody watches CNN US, MSNBC or Fox News to be informed, it's to hear what is in their own echo chamber. The BBC and Sky at least attempt to inform of both sides, even if they get accused of bias.
There was a time when you'd get US news channels actually spending proper money on things like reporting the news, but is much cheaper to hire the likes of Sean Hannity, Rachel Maddow and the gobs on a stick on Outnumbered, The Five and to bring it back on topic State of America.
Sorry, disagree entirely with you there.
Fox News, and the other right wing channels such as CRTV, Right Side Broadcasting, Newsmax TV, One American News Network and the others, are the only ones preaching to their own converts.
But that still leaves not just "liberals and progressives" but also independents and moderates who have moved away from the likes of FOX News because it has gone so extremist. These people are the ones who watch the likes of CNN and MSNBC. Neither channel is talking to their own tribe. It's only those on the hardline extremist right.
To equate CNN and MSNBC as being somehow mirror images of Fox News, is like saying that every shade of grey that isn't black, is white. It's a gross over-simplification. The only stations that are or were ever a mirror image of Fox News were actually Current TV, and currently Free Speech TV. That's truly it for progressive TV broadcasting in the US, compared to Fox News, CRTV, One American News Network, Newsmax TV, Right Side Broadcasting, CBN News Channel and The Blaze on the conservative side.
Right wing thinking dominates broadcasting compared to progressive viewpoints, which have very limited avenues for getting out there right now, and to say that CNN and MSNBC are mirror images of Fox News is not only factually wrong, but a gross misrepresentation of the facts.