To me it's reading from different perspectives and other's writing style. It's really important when it comes to political stuff or anything else that you need to base a decision on.
But I think it applies even just to plain articles about a niche you follow.
Like, maybe some new GPU features get released for Linux or something. Gamingonlinux might cover it from a Gaming perspective whereas Phoronix might focus more on the hardware aspect of things and the original blog post or changelog or whatever might just give a mostly a list of changes and a description.
Post one article from a trusted source like Reuters or AP News. If you want to link other articles, post links to them underneath the main post, either in the post text or in a comment. No need to flood feeds with recycled articles.
This is the solution I like best. I do like having multiple versions of a story to read though! :)