The problem is that the kids come in not speaking hebrew or tiddish, the teacher takes hebrew (which the kids don’t understand) and translates it to Yiddish (which the kids don’t understand) and then the kids have to figure it out nack yo English.
So if you’re smart you can do it, if not you suffer
The bottom line is that yiddish is a language and needs to be taught as a language. Chumash is a subject and should not be used as a tool to teach yiddish.
It’s simply bad pedagogy.