Not an expert, but I think pansexuality is a generalization of bisexuality. As the concept of bisexuality existed before the new gender identities were born (like transgenders or non-binary people), there is a chance that some bisexuals won’t accept those new genders for some reason (would be like some kind of only-cis bisexuality), so a new concept, pansexuality, is created in order to explicitly include all genders and sexualities.
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