I agree and prefer black blacks. It's very common in design books to say that's an absolute no-no, however. So graphics people must think it looks better somehow.
Funny how that changes all of a sudden, with the whole history of printing being an effort to get as close as possible to perfectly black ink on perfectly white paper.
Even for body text? I've seen advice that titles should be gray, but that's to make it subjectively match black body text, because bigger text looks darker.