Spot on. Just another symptom of a quantity obsessed culture. It's telling that people ask how many books did you read this year and not what was the best book you read about (a question of quality, over quantity).
Don't get me wrong, most books are overly stuffed and could stand to be much shorter, but you aren't going to take much from 5 minutes of a summary alone. I'm convinced that it's not really a learning app as much as it is for puffery.
Yeah I really can't think of anything worse than reading only summaries of books in an attempt to retreive efficient information. The point of the book is the journey and how it makes you feel. Even a non-fiction book.
Summaries just like asking ChatGPT to state the key takeaways of a book all lack the story and connection that helps us relate to the information in a human way.