tmb: What I mean to say is that I don’t believe spending time on teitch is considered ameylus baTorah. Maybe it would be something like hechsher mitzvah or something but its a chiddush to me to hear that it would be considered ameylus mammash.
oomis: I have heard many times although I do not know any source, that learning Torah can only be done in a “clean” language. That is why we have learned in Yiddish, Ladino, Jewish Aramaic or Loshon Kodesh itself depending on the generation. I heard this regrading the fact that nowadays Yeshivish is considered its own language instead of a part of English so that we can use it to learn since it is ‘clean’. (clean: no words related to things we do not talk about)