Cherrybim, my hostility to “Holy Yiddish” is because it isn’t holy. I have a right to follow the poseik hador, Rav Moshe Feinstein ZT”L, on this point, as well as my rebbe, a native yiddish speaker from Europe, who called it an “amaleikishe lashon”. The Mishna Brura didn’t call it a lashon hakodesh. Neither did the Aruch Hashulchan. to them, it was the lashon chol of the balagalos. Until I see a HALACHIC mekor for “heilige yiddish”, it’s bal tosif to say it. If someone made up a mitzvah and said pink bandannas were holy, I’d have the same hostility.
So let’s ignore the “hostility” and boil it down to one line- Rav Moshe Feinstein ZT”L paskened it’s NOT holy. He was the poseik hador for America. No such mitzvah .The end.