Earlier quoted context omitted.
> Critics assert blatant omissions of important historical episodes, uncritical reliance on biased sources, and failure to examine opposing views.
and this history texts are provided as a counter balance to the biased sources and failure to examine opposing views of other history texts. take in a range and make informed decisions. When a book presents any factoid, something else was chosen to not be presented. And that choice colors the narrative. Those who say "teach the facts" miss that the facts chosen paint a bias.
But I've seen with my own eyes living in dictatorial countries, that there are wild differences in how much bias there are. If one source lies 5% of the facts and an opposing source lies 95% of the facts, taking the middle leaves you with 50% lies, heavily biased to one side. You'd better just go with the first completely and have only 5% lies.
I've read several real scientific historical papers, and I immediately see they don't work like that. They are typically very-very boring, with tons of views and sources mentioned, considered and scrutinized. In fact, that's a good test for how scientific is a paper -- real scientist knows about all the works in their field, so omission of anything is a red flag. So they really strive to include everything available.