Writersoul: That is the Shittah of the Geonim and (more recently and relevantly) the very widely-accepted Shittah of the Chazon Ish. The Rambam and Kessef Mishnah, however, argue, and that seems to be the opinion accepted among the Achronim who, albeit in very rare cases, do argue with Rishonim on occasion (the Gra and Sha’agas Aryeh did it a lot, and even R’ Moshe did it twice that I’ve found). Everyone agrees, however, that no one after Ravina and R’ Ashi can argue on the Amoraim. (Sort of; we let Geonim get away with arguing with the Gemara because we assume they had a different tradition of what the Gemara/Amoraim said and therefore we treat some Geonim, especially R’ Achai and the Bahag, as if they could argue on the Gemara.)
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