Why is representatively fair the gold standard? What if in 10 or 20 years we view one of the other methods of optimizing as a more "fair" way (i.e. what if our current consensus on what is best is not absolute truth, but a social and cultural bubble)? Then all our algorithms will be sub-optimal (at that time).

Just as different cultures value these differently, it makes sense that one culture that changes over time might as well.