“And if you ask a Sefardi, he’ll probably ask, “What’s Yiddish?” Their daily language before/outside of Israel was/is Arabic or Persian. “
Or Ladino, as others have noted.
There are more sefarim in Ladino than in Yiddish. There are more sefarim in Arabic than in Yiddish. There are more sefarim in English than in Yiddish. I’m not anti-Yiddish, but facts are facts.