For a long time learning required a primary attention of a person. Usually a monopoly attention. You can't read printed text and do something else in parallel (fidgeting doesn't count). Radio and TV facilitated background viewing and listening but there weren't many options to personalize those. And then IT revolution happened and humanity discovered that they can do something as a primary attention task and "learn" in background by listening to a narrated educational media. And with the invention of speed-up, those people are now debating is x2 speed-up too slow, and just how fast can they go while still discerning words.

it's my personal hot-take, but I think that a majority of those background listeners are doing performative "learning" and aren't learning anything really. It's just to brag once a year that they have "read" 100+ books in a year and post a wall of covers or a number on their social network feed.

Basically, books aren't morally superior media than anything else really. But focused and monopoly attention dedicated to some media is morally superior to a performative background "learning". Books simply eliminate even a possibility of reading them in background.