Are there any famous rishonim or achronim (outside of Yemen & besides the Rambam) who hold doing chalita to meat is necessary?
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The Sephardim who performed chalita don't do it anymore based on scientific basis. The machloket for hundreds of years was wether chalita was a requirement for kashering meat or it did the opposite and rendered it non-kosher. Science shows that chalita makes it impossible to ever kasher the meat. So to answer your question, nobody nowadays practices chalita