In this topic, we may be dealing with "perception" as much as or more than fact.
Depending on when your perception of media begins (as in 'what is your age?'), depending on where you ranked in the society's pecking order ranging from class to crass, you will have a totally different view of the place of media in society, and the value and appropriateness of media content.
Except for a short gestation/incubation period (1939 to 1949?) when was TV anything but a mass media for the great unwashed? The people with "class" were much too occupied with concerts, book clubs, meetings of the D.A.R., social events at the country club, and travel for the sake of travel. The people with class were busy keeping up contacts with their alumni club because it was good for career advancement. People with class were reading non-fiction books about class and history and the progress of mankind. They were busy forming and running charitable organizations to look after the health and welfare of the bottom end of the great unwashed masses.
The morphing of advertisers may have had as much input into media change as the morphing of the audience. Back when advertisers were companies with the name of the founder, and the founder or off-spring with the same family name still ran the company, programming content was sometimes driven by the "class" of the women in the family. I remember working in a radio station in farm country where the Purina Dealer (for the unwashed masses of city folk... Purina was the leading company in the era for manufacturing food for farm animals. Pet Food would come later.) and the dealer wanted to sponsor our daily farm news program. We had a peculiar bit of music for theme music (what we cal bumper music today?) because his high-class wife did not want to face her friends at the ladies club and other gatherings and be known as the family sponsoring a program that didn't have class.
The farmers sitting at the kitchen table in bib overalls and wearing boots with bits of cow manure on them didn't give 'two whoops from hell' about the theme music.
One last suggestion: "We do it because we can!" Maybe the biggest change in how broadcasting does news is similar to why Victorian Homes in America have so much ginger-bread trim as part of the style. We do it because we can. New technology meant we could do things we used to not do. We acquired 'mobile news units' and we are going to use the thing whether there is any news that require mobile coverage or not! The 6 P.M. news on TV in many markets today has at least two fires in progress with maybe a total damage of $20,000 between the two of them. We bought that helicopter and equipped it with live cameras. Now get out there and find leaping flames whether they are important or not. Now that our audience has phones with cameras, put at least three photos provided by viewers via their phone on the air whether they are portraying news or not.
Isn't it wonderful to be part of the 21str Century!