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The discussion on our daf relates to the cups of wine that must be drunk to close the meal and to welcome the Shabbat. According to the baraita we will need two separate cups of wine, a ruling explained by Rav Nahman bar Yitzhak as stemming from the principle ein osin mitzvot havilot havilot – that we do not perform mitzvot “in bundles.” The idea is that every mitzva deserves its own focus, and if we try to perform several mitzvot with the same cup of wine it will be impossible to focus on each mitzva separately. A similar idea is ein me’arvin simha be-simha – that we do not combine two joyous occasions (e.g. to have a wedding during Pesah or Sukkot), because each one deserves its own focus.