I’m guessing it also helps eliminate the “blue collar asian” applicants more easily. It removes one of their shining accomplishments.
From a 2018 article from politico:
https://www.politico.com/magazine/story/2018/10/21/harvard-a...
“But the data collected by the Education Department contained some explosive information. It showed the athletes and so-called legacies who were actually accepted had lower SAT scores than the rest of the class and were also deemed less attractive candidates by the admissions officers conducting Harvard’s process.
Some of the comments those officers wrote on the application folders of admitted legacies strongly suggested something more than a tiebreaker was at work. “Lineage is main thing,” one reader wrote. “Double lineage, but lots of problems … no balance,” the notes on another successful application said. “Lots of lineage here … Hard to explain a NO,” yet another said. “Classical case that would be hard to explain to DAD.”