Rabbi Bender is truly a pioneer in the field, and he is unfortunately an exception to the rule. There are several programs to train mechanchim. However, there is nary a yeshiva or girls school that requires such training as a qualification for the job. The nearly universal feature of today’s chinuch is that it is geared to the slightly better than average student, and those students who struggle are left to their own to somehow manage. Most schools put the responsibility on the parents to provide additional tutoring or services.
One of the telling signs that a mechanech is good is whether former talmidim maintain connection years later. I have noticed an increase in responsible chinuch, with training and expenditure of effort to build skills, plus the individual connection between rebbe and talmid. But this still remains the minority, and that is shameful and dangerous.