It has to do with the speed of information, the speed at which we want. It is how CNN actually build a bad reputation for themselves as they were trying to be quicker than others rather than reliable what led to incorrect information being reported on.
Because information has to come instantly to compete with other online sources that means reviewing and editing is done at a minimum, that's why as you say investigative journalism is worth reading because those articles take a long time in the make and are build very solid, the reality is most news outlets can't function on that because their income comes from add revenue and so it is the number of views, clicks or papers they sell that makes them financially viable and stable in the long run. Although News agencies also simply just mimic our behaviour we want faster and easier digestible news because we are always in a hurry, the majority of people don't got time to listen to an hour long debate.
So those investigative pieces while great examples of how journalism should be done are actually very expensive for such companies and there for they can't be used as the foundation to build your news agencies around.
This also goes for talk shows, how few of those are actually long enough to give a guest the correct amount of time to express themselves, allowing the person to go against the grain, something that has caused people to drop MSM and resort to social media platforms that are unfiltered and unchallenged when i t comes to promoting close minded believes, what in my honest opinion is one of the causes why right leaning folk got more radicalized over the years, although the left isn't completely immune to this either.
I do find accountability has to come in place and how much i dislike censorship, how easy it is for anyone these days to declare themselves a reporter through social media outlets is something that is not okay. Fact checking has to come and i find it even has to be done in a matter a company who provides the platform can be held accountable however..... I also understand the risk in doing this, not for our western world but for countries of people in oppressed nations those governments could also use those tools to silence any opposition they have even more.
What's the answer than? No idea nothing seems to come without its downsides, was simply pointing out it is not simply a matter of wanting to do good. Although Fox news and OANN are really going overboard to the point you can say there's the intend to lie. So it would be nice that at the very least new agencies are forced to correct their mistakes or even falsehoods.