Harvard’s seeks to ‘acquire’ an inventory of future leaders. Any criteria that might produce a future leader is sufficient. That’s the selection process in an nutshell. And that is the reason for their market leadership.
Harvard and Yale were originally THEOLOGICAL institutions producing talent for the clergy that performed society’s managerial functions – and by and large they have retained that position but in secular verse (or at least until the 1960’s when postmodern pseudoscience, pseudo-rationalism, and outright lying were introduced as the next ‘cult’.)