Earlier quoted context omitted.
Why do you need to plan/grade ? Why isn't that automated?
Planning needs to be responsive to how the prior lessons went. You can't simply pre-plan a whole year and expect those lessons to be effective. Eventually, you can get close to that point, if you are lucky enough to teach the same subject for years. But much like you can't expect a standup comedian to perform someone else's routine effectively, as a teacher, each individual has to figure out what's effective for them…
Your students are forming a mental model of how something works. Your job is to help guide them to the correct mental model.
If their mental model goes wrong, you have to debug it: you need to figure out exactly what they've misunderstood (which could be anything, and could be from years before your lessons with them started) and help them correct.
Here's a really good detailed write-up of this idea: https://teachtogether.tech/en/index.html#s:models