Earlier quoted context omitted.
Lesson plans vary by the day, so I’m not sure how exactly you would do that without the data from the previous day.
Teachers aren't paid to personalize lessons though, if you work overtime to do that then you can only blame yourself. Teachers are paid to hold standardized lessons and answer questions help students with problems. You could argue it would be better if teachers were paid to personalize lectures, but they aren't. Maybe some document somewhere says they should, but in practice nothing will happen to you if you just use…
Sometimes, a group of students might need to speed up, slow down, or go in a wholly different direction depending on what happened with the previous lesson. There’s a lot of variation between one class of students and another, and teachers are not some kind of omniscient perfect predictor of behavior. And ultimately, you need to cover a whole curriculum.
There is a whole spectrum between teaching centrally dictated lesson plans and individually crafted tutoring, and one of the requirements of teaching is to be able to adjust lesson plans according to reality. We don’t expect software engineers to waterfall every last character in code down to the wire, but teachers are supposed to do this with unpredictable human children?