Patur Aval Assur, regarding your question how someone who holds like R’Hillel be an apikoires: If there is a machlokes in the Gemorah if one is allowed to do something on Shabbos and we pasken le’chumrah. If someone goes and does it nowdays, he is a mechallel Shabbos. The same is with the R’Hillel’s shittah.
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