An "interest" seems to me like it has a bit of a connotation beyond a "preference".
It suggests some substantial motivation that I'm not sure ESG policies rise to the level of.
Individuals working for Vanguard have some motivation to talk about ESG and go through the motions.
But at the end of the day, if they buy all the stocks, and if their customers understand that they buy all the stocks, then how can ESG considerations make a meaningful difference in the overall job? It seems way too constrained.