like sorry i don’t give a shit about whatever editorial infighting led to this retcon, franklin being born a mutant is important because, like any other non-x-men mutant, it emphasizes that *anyone can be born a mutant.*
Like sorry this mutant registration act poster + that he was a New Mutant murdered by sentinels in the Days of Future Past story will forever cement him as a mutant. His story and the F4 are enriched by him being one.