DaasYochid:
“It says maaseh v’reishis”. Best, in order for you to understand better the meaning, see Tur siman 271 says the following
?????? ????? ????? ?????? ????? ???? ?????? ???? ???? ?? ???”? ???
????? ???? ??????. In other words, to remember the Shabbos which was after creation (it not refering to how the world was created).
“It isn’t questionable lehalocho It absolutely is questionable; not definitely wrong, not definitely okay – questionable”.
It is not questionable to those who were noheg so.They were comfortable with the pshetel and didn’t have enough doubt to change for regular wine and beshiur revi’is.