One of the weaker points of Wikipedia is the way editors lazily refer to journalistic "reliable" sources as authoritative when a significant amount of the time the journalist is lazily using WP as their own source. Just a couple of these circular references build up a circumstantial base of "evidence" which is then itself used to bolster the original weak claims which often reflect nothing more than an editorial or j…
Not only WP: An increasing amount of articles just cite "sources say" or "an unnamed U.S. intelligence official says". Then the entire world press copies the article within hours. Even Reuters and AP have adopted the practice. Then Wikipedia cites the narrative as the truth.
Hold on, when is it you think that newspapers did _not_ do this?
In general, if a paper is writing about anything vaguely contentious, it will use unnamed sources; if it names its sources then its sources won't stay sources for long, and the media will become little more than a system for regurgitating press releases. It is always worked this way; this isn't new.
(There was a fun bit in "Yes Minister" where the minister, while leaking something, was offended that the journalist wanted to use "sources" instead of "sources close to the Prime Minister" to attribute his leak...)