The convenience of this scheme is that if you complain about being treated unfairly, you can be either told "sure, it's because of systemic discrimination, we'll fix it right away", or "you're just complaining because you're afraid of losing your privilege" - and this does not depend even a little bit on your own actions and your own achievements or qualities. It only depends on who the powers external to you pre-designated to be "privileged" and "oppressed" - and they did it not knowing who you are, what's your story and probably before you have been born even. Your experiences and concerns can be central or immediately dismissed just because somebody sorted you into one group or another. And it's your own fault, for being in the wrong group.

And the most funny thing about it is that people propagating this system actually thing they fight for equality and against the abuse of power. While this is exactly how inequality and abuse of power is done.