Here's an Op Ed written by the president of the American Historical Association that lays it out pretty clearly in favor of the change.

The new Framework continues its theme of oppression and conflict by reinterpreting Manifest Destiny from a belief that America had a mission to spread democracy and new technologies across the continent to something that ‘was built on a belief in white racial superiority and a sense of American cultural superiority.' -American Principles in Action and Concerned Women for America

Anyone else notice the irony here?

Seriously though, if the new framework encourages students to question traditional classroom narratives and to engage the 'sore spots' in American History in a more objective and critical way, more power to it.

A bit unrelated, but how much do teachers have to follow these guidelines? I took APUSH last year and while there were many things that annoyed me about my teachers class, the worst was that most times we came across any issues relating to women or other minorities, he would laugh loudly and flip the page and we would never go back to it. I realise that the American Pageant is a big book and it would be impossible to go over everything in class, but we would never go in depth to any issues that didn't involve a war of any kind, and if we did it was mostly just common knowledge. Would these new guidelines basically force him to go over these issues to a greater degree or can he just ignore it if he wants to?