You gotta love that the shavers rely on Reb Moshe while they use the eruv in NYC and Flatbush and BoroPark.
Who does that? The Litvaks don’t use the eruv, and chassidim don’t shave. Besides, unless someone is a talmid muvhak, they don’t necessarily follow one posek for everything.
And don’t belittle being mevatel the mitzvah of sukkah, it the issur of eating before davening. They’re both wrong.