Cherrybim, is Rav Dovid Cohen actually arguing on Rav Moshe Feinstein ZT”L or not? “Mima nafshach” (there’s that Aramaic thing again)- if he is, what’s his mekor? If not, what’s the “nafka minah”?
Even on the tzad (one that is rachok min haseichel, but lu yitzuyar) that he holds it’s a mitzvah, wouldn’t he agree that a yid is better off spending his free time learning actual Torah instead of Yiddish?