Perhaps also the modern meaning of "wife" heightens the sorrows of their separation - makes it seem more profound and "unnatural" - the separation of spouses rather than genders. It empahsises the individual personal tragedies within the widser catastrophe for the species.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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