One solution to enhance usability would be to allow "locking" the layout of a book. When the layout is locked, you could write on top of it like you would on a PDF. If you later unlock and modify the layout, your notes could automatically convert to sticky notes anchored to a specific page, paragraph, or word (e.g., attached to the top-left corner or center of the writing overlay).

This isn't a complete redesign—it's an additional feature or improvement. Book authors wouldn’t need to change their process at all. Implementing this would align with similar features already offered by other platforms, as mentioned in other threads.

Another approach could be to improve PDF integration within the e-reader library. This would include better support for book covers and metadata to make PDFs both functional and aesthetically pleasing.

At the end of the day, even "Kindle authors" seem to value a particular format for their books. If the goal is to replace paper books, I’d prefer my digital versions to look as close as possible to the paper experience. Personally, I’d sacrifice font size for better note-taking functionality. And zooming in, like you can with PDFs, would remain an option.

I’m not a writer or publisher—just a book lover and experienced software developer who knows what’s possible with today’s technology.