hypergamy is only eugenic when the new pairing produces more-fit offspring than the previous pairing. And even if its technically eugenic on the individual scale, it can be very anti-social and dysgenic in the long run on a large scale. When social trust breaks down between men everything else soon follows.
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nostr:npub13xhpusxfq9frzvjh896z4ukd2s8dxthqqq5py7fgu9qrxfr8f09sqe9x2y a key that opens many locks is a master key. A lock that opens to many keys is a broken lock. Having too many master keys makes a building less secure