not to give detailed feedback to bad answers
If your goal is to foster understanding instead of giving canned answers, this seems counterproductive.
If you're after feedback-for-understanding, providing a student with a list of questions they got wrong and a good solutions manual (which you only have to write once) works most of the time (my guess is around 90% of the time, but I have low confidence in my estimates because I'm capable of successfully working through entire textbooks' worth of material and needing no human feedback, which I'm told is not often the case). Doing this should be more effective than having the error explained outright a la generation effect.
Another interesting result is that...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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