Since this was at LA Unified, I suspect the bar for passing is extremely low. Not commenting on that district specifically, but not graduating from High School on time takes some doing. The system is very good at moving kids through, and it's why a high school diploma means so little.

One of my teachers implemented a system like this. What they ended up doing was making it so that you had to score a (effectively) 9/10 on major assignments to pass the class (minor assignments were graded on completion), but had an infinite number of revisions with which to get this grade with feedback being provided each time you tried. Pretty much everyone passed, with more work required from some than from others. The only issue it ran into was with the final paper, where you (realistically) only had time to receive and make one to two revisions before the end of the semester and the deadline to submit grades.

According to the equitable grading materials I just received (and posted above), that determination is... entirely up to the individual teacher's discretion? I might be misunderstanding.

At most universities you can talk most classes pass/fail by choice which means A-D is pass and F is fail.

The nice thing about an all pass/fail system is you can formalize the 'new' way grades are actually done in which A means meets expectations and anything less means did not. Making pass mean A/B takes a lot stress off students and C/D is already failing for practical purposes as often you can't continue with less than a B.