Let's say the news is about a plane crash. At first it is reported that there are 10 deaths, but a few hours later it's reported that there are 100 deaths, and then 99 deaths. So imagine we are writing an article for a newspaper, or even a Wikipedia article. The reporter or contributors are trying to find out the truth, because their objective is to create "the perfect article". So when the later death toll comes in they will often rewrite the original article to make it correct, but in doing so they hide the original reporting. The reader will see an article that says: Plane crash: 99 dead.
Newspapers don't print feeds, there's no room. But if you have the archive to hand, as a database, then you don't need to make a perfect article. You just need to add updates as they happen.
Event 1: Plane crashes 10 dead
Event 2: 100 dead confirmed
Event 3: Actually 99 dead
This leaves the original events as a record of what was reported at the time, but the reader can also see the update. This is important to readers because while information can be added to articles, it can also be taken out, to try to conform to a narrative. Wikipedia is particularly prone to this kind of selection bias dressed up as fact-checking.