That kind of reporting is expensive, both directly and indirectly (in terms of goodwill and access to politicians). Newspapers are burning too much money now that they no longer have a monopoly on news (and, more importantly, ads) so they have to cut costs -- and the easiest thing to cut is the kind of expensive reporting that we really need them for.
I am almost always downvoted when I say so, but the NYT is not a good paper anymore, it has become a rag -- it may still only print what is fit to print, but it has long ago stopped printing exactly the kind of news they should be printing -- and which I would have been willing to pay for.
Augmenting a story with accountability and completeness is arguably the primarily responsibility of newspapers and journalists, especially in the Internet era.
Reporters from traditional magazines talk to interesting people, write articles and newspapers print them (of course I simplified things a bit).
But today I can directly connect to Elon Musk and Bill Gates twitter feed. I don't need any middleman to read blogs written by experts. How reporters can add value, do we really need them?
Yesterday I've got email from Vint Cerf about free and open web. The question is why this action isn't initiated by journalists?