Another angle of attack on the MSM might possibly be the control they exert over visual media, as we saw over the missing SOTU near-frame photos. The control over available news photos and video released to the public sees is extreme and often used to shape an editorial narrative. This message control happens invisibly and independently, often separate from news outlets themselves. The content is gate-kept at the highest levels, as well as further down the line.
For instance, few realize that during the Obama administration even the MSM media was effectively excluded from photographing Obama in all but the most scripted public events. This exclusion was actually extended to the MSM outlets and wires themselves, to great consternation. The White House Press Photographers Association tried to raise an outcry at the time, but they were effectively shut out by Obama and his chief photographer Pete Sousa. The media, of course, shared little of this outcry, as it would have shown a light on their weakness in advocating for access, and willingness to essentially ignore their role as the Fourth Estate.
Virtually every candid photo of Obama anyone remembers was taken by Sousa, who was basically acting the role of a govt. PR photographer, providing selected content to the wires and outlets.
If you listen to various interviews, you realize he is an uncritical true believer, not a journalist in any traditional sense. (Here's one from NPR: https:// www.npr.org/2017/11/07/562341917/photographer-pete-souza-reflects-on-8-years-and-1-9-million-photos-of-obama)
These uncritical and photos were handed out to the MSM, as the only content often available for the entire 8-years. This greatly shaped public perception of the administration, bracketing their own narrative control with the MSM. People tend to place a lot of belief in what they "see". As we've seen here, what we see is often held back behind an impenetrable firewall by private news companies and wires.
Considering how many relatively unknown photo editors, producers and line journalists also appear to resemble the Mockingbird model, you can imagine this effect on public perception.