How dare you gatekeep how people interact with literary material? Who(M)ever purchases/inherits/ditigizes/burns a book has to deal with it, and that dealing with could include ignoring it like a grown up, using some whiteout, or if digitizing, using any of the myriad photo editing software available. Sure, maybe don't put your grocery list on a first edition of some rare Chaucer book, but Chicken Soup for the Teenager's Soul? Study guides? Infinte Jest?

A book with notes is a guarantee that the book didn't spend its life sitting on a bookshelf not being read. If people are reading it is a net positive for overall human knowledge.

Lastly, your usage of Socratic teachings is a hollow appeal to authority. Socrates is dead and a modest library in an elementary school would surely have brought him to tears had he known how far we've come as a species, much less the remainder of books currently available.