Even in math, this isn't really the case. THere are numerous reasons a student might arrive at an incorrect answer. I've seen systems that provide specific feed

Even in math, this isn't really the case. THere are numerous reasons a student might arrive at an incorrect answer. I've seen systems that provide specific feedback on certain anticipated errors, but tailoring the remediation to individual students is just as hard as teaching the material successfully in the first place. It's often not just a case of "oh, I did this one step wrong", but a deeper issue of misunderstanding the abstraction. We haven't mastered bridging that gap with real-life teachers and tutors, let alone automated software.