DY – The standard “You may never be not Tzanuah, because a man may see you, even in your own house”. Chazal say the exact opposite, ?? ?? ?? ???? ?? ?????? ????? ?????? ??? ???? (Kesubos 72B).
For Mussar it isn’t bad, but even the Mishna Berurah (i.e. the author) wouldn’t say all of this as Halacha. Even if he did for the Shuk (not at home), it would still be L’shitaso that this is all included as Da’as Yehudis.