“Some of the Chassidishe yeshivas intentionally keep their students functionally illiterate in order to deter them from going off the derech”
I hope what you are saying is incorrect, but if true, keeping students functionally illiterate is no guarantee they won’t go OTD… More likely , it will guarantee they will be unable to earn a parnassah or find a kallah who has any aspirations for a normal life. In fact, it is more likely than not to make them unable to function in society and ultimately lead them to go OTD