HaKatan: I am entirely rejecting your assumption that “MO” (the fact that this Rav is even “MO” is an assumption you are making based off a subtitle) bases their Halachos on anything other than Halachic sources. I am very strongly protesting your implications that “MO” is an ideology that in some (or any) cases overrides Halacha.
Oh, and the Rambam says that “Hakol Muttar”. And Pashtus in the Gemara in Nedarim is against the Chumros brought down in those Simanim in Orach Chayim.