>...I simply can’t discern features of the field itself that have been put in place to perpetuate inequities.
If you don't understand how systemic inequity can persist without overt bigotry, then any kind of affirmative action is going to seem counterproductive to you. But bias is self-reinforcing; once it happens for any significant amount of time, it persists even among people with no conscious bias. If you don't actually see a minority doing a job, it becomes slightly more difficult to imagine them doing that job, and that small difference, aggregated across millions of people, adds up to a significant ongoing effect. Add in the economic consequences, and you have a further reinforcement. It's like a traffic jam that persists long after the accident that caused it is cleared. And of course, that assumes that there is no longer any conscious bigotry and clearly there is: there are still organized groups in the US publicly advocating white supremacy, for instance.