Well Dinah being a singer at Black Mask's club and being cynical due to her mother's death and being bounced from one foster home to the next is certainly new. With very few exceptions, most white superheroes could have been minorities with little or nothing to change and the more diversity there is, the more it is normalized.
Superheroes are built on cliches. We had stories about vigilantes and people with extraordinary powers before superheroes. And considering how much overlap there is between superhero and detective stories, Montoya is not out of place. Hell, she was a supporting character in Batman for years before she became the Question.Renee Montoya isn't a member of the BoP in canon, and without her Question persona, is strictly a supporting character. She'd be great in a noir series, or detective story, but her story as 'disrespected Lesbian cop' simply is too weak to hold much water in a super hero movie. Cops have been bucking the system in movies for so long that it was a cliche in the 80s, and stopped being interesting long before then.