This is just a formula for arbitrary grading, and given her interest in "equity" you know she's just fucking over demographics she hates. It's also really fucked up that she won't tell her students where they stand in her course. Eventually the withdrawal deadline comes and students deserve to know how they're doing so they can make the best decision. I'm sure she uses this fact to fuck over groups she hates as well.

All that said there are ways modify the system so that the focus on grades doesn't harm learning. My English Composition professor allowed us to revise each assignment as many times as we wanted and he would regrade with no penalty and no possibility of the grade going down. I also took a programming class that was mastery based. The assignments were pass/fail, but failed assignments could be resubmitted as many times as necessary to earn a pass with no penalty. The problem with those ideas from this cunt's perspective is that they take effort on the part of the instructor and there's still an objective basis for evaluating students, so fucking with students' grades for arbitrary reasons isn't feasible.