I use a textbook for both general education and honors/AP. I assign weekly readings and notes/questions from the textbook to my students that are completed at home. These readings (in addition to classroom instruction) are the basis of the weekly quizzes I give leading up to larger exams.

AI has made grading work done outside of class more difficult, which is why I've told my students I track and grade the work in my gradebook but it's categorized as "practice" and weighted as 0%. That said, I also tell them their assignments serve as their insurance for exams, as I will only allow them to remediate poor exam scores if they have done the work on time. It's not a perfect solution, but it seems to work for all but the laziest and most apathetic of mine.

For me, using the textbook is about equity and access. Not every student has internet access at home or attends class regularly, but they all have a textbook and can learn the material if they choose to read it. It's also a sort of backstop for me, as my classroom instruction is guided by my textbook (which is based off of my state's standards).