I think you've mistaken me. My argument is that if we take the standpoint that we don't just want the metric to be whatever is short-term economically optimal

I think you've mistaken me. My argument is that if we take the standpoint that we don't just want the metric to be whatever is short-term economically optimal for the designer of the model, we should just stop/ban it now, because we already know that we're going to have to kill it once we actually understand it properly. It's only allowed now because we haven't figured out the bad things that are happening. Inventing more and more categories that businesses are not permitted to discriminate upon is precisely the wrong approach - if we're talking about huge companies and not the bakery down the road, we need something that's more like 'you need a very good reason to exclude someone', rather than 'you can exclude someone for whatever reason they like, unless they're a member of the set of continually extending list of protected categories'.