Avi, I was referring to the progenitors of the two languages. Yiddish was born from Torah life and has many, many expressions that are based on Torah and chazal. The fact that people came later and abrogated it, and poisoned it with foul things does not affect the yiddish that we have today and that is spoken by frum “yidden”.
Hebrew, by contrast, was designed for the specific purpose of “reviving” judaism to be zionism, a culture with a land, language, etc…it was created from infancy with a disdain of Torah.
As per your quotes from Rav Moshe – Rav moshe himself, did not speak lashon kodesh. Neither did virtually any of the rishonim, achronim, or amoraim!! He calls it a “ma’aleh”, and he says that chasidei elyon did not take upon themselves this maaleh. To think that we are above them is hubris and the height of arrogance.
Also, it’s a moot point because… Again, eretz yisroel does NOT equal the state of Israel, and modern hebrew does NOT equal lashon kodesh. Tell me, when the “people of ill repute” talk to customers in Hebrew, is that better or worse than if they were speaking in Arabic? What about gangsters and robbers? Also, the rambams definition of what makes Hebrew holy does NOT apply to modern Hebrew in the slightest, even if it were purely based on lashon kodesh, which it isn’t.