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.