You aren't limited by DRM imposed by the various educational companies. (I loved only being able to download and print 5 sequential pages at a time when you're looking at printing a page of questions for each chapter)
I find it more engaging with using a real textbook. You can feel the pages, write in the margins, not be distracted by things like apps, etc. on the same device.
It's so much easier and faster to flip a section of pages when you want to quickly flip between different chapters/pages for referencing other parts of the textbook as opposed to janky UIs.
I know we're both being anecdotal, but it seems like my opinion is going the way of the dodo, considering the younger generations grew up with staring at tablets/screens from day one so they're used to it.
Also underrated is how easy it is find find something in paper book, based basically on how thick the two sides feel in your hand.
Also, iOS 13 is finally adding highlighting for PDFs, which I’ve found to be frustrating.
Now I can highlight and markup the page with Apple Pencil before I print something.
Ideally with color support. Color does so much for learning, whether it's syntax-highlighted code samples or microbiology explanations.
Also, looking back at my notes and other materials from school I usually ended up with a few hundred pages of paper from a given class. Whether or not that all transitioned to digital for initial creation, you probably would ideally like to archive all the materials from a class together in one place.
This seems to be happening more than a decade after it should have.
My son used some Pearson books in high school. He doesn't "have" them anymore.