Well, no, if you think that legacy admissions are unnecessary (because, to the extent genetics have an effect on the outcomes you care about, they'll show up in more direct measurements), and counterproductive (because they presume a simple relationship rather than a stochastic and messy one.)

OTOH, legacy admissions make a lot of sense if the outcome you care about is serving an elite class defined rather simply by familial lineages.

If you think genetics matter for success (or whatever you want to call it), test scores are a proxy, but a successful parent is a direct measurement of the trait.