For me, the question of Warren's claims about her ancestry is a question of the philosophy of diversity.
And for me, it's less important what Warren thinks about her own ancestry (then or now), and more important what Warren thinks about self-identity and diversity policy in America.
As a presidential candidate who has in the past played fast and loose with diversity, and who is now taking the approach of "I apologized, what more do you want?", it seems like a relevant question. I'd like to see her give a coherent explanation of her administration's diversity policy, and her philosophy of diversity that informs it.