Most plants are hermaphrodites; all organisms invest lots in kids. But most animals reproduce via male-female pair; males invest much less in kids. Males must contribute some big compensating gain to animal species, but we now have no idea what that is. https://www.overcomingbias.com/2018/06/men-are-animals.html …
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Your last point doesn't show an advantage of male-female species vs hermaphrodites.
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Hermaphrodites have female-transmitted mitochondria that bias them toward female reproduction. Once there are more females, specializing as male is useful
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