My impression is that a huge portion of identity politics and coverage is more about picking fights where each side can feel smug and superior, rather than actually changing things for the better.
Broadly speaking, it's the study of how law and media impacts society's view and treatment of others through the lens of race.
As for my opinion on it:
I generally support it because it advocates for another mechanism to study the impact of law.
I think most legislation should be regularly studied for impact, effectiveness, and fairness. For example, stimulus bills ought to be reviewed for economic impact, regulation ought to be reviewed for effectiveness/relevance, laws with social impact ought to be reviewed to ensure it doesn't harm the people.
A number of scholars seem to adopt a blameless mentality to figure out how laws (even unintentionally) have negative impact, and use that to propose solutions. I admire this approach to legislative critique.
While I think a few ideas some scholars advocate for are infeasible to implement, the broader field has a lot of merit.