E-reader: libraries exist and should be used. Paper books are still better.
White noise: ludicrous. If you pay for Spotify or any other streaming service, you can get an endless stream of white, pink, or brown noise, or rain, ocean waves, or diesel engines if you prefer. Or for free on YouTube. Or you can use an app. Or you can make your own with Audacity.
iOS also comes with a password manager, although it’s a serious work-in-progress that isn’t cross-platform. Nonetheless, it can be extended a little with Shortcuts.
FWIW you're still supporting your local library if you're checking out ebooks from them
Fair enough. I personally prefer to play it on my separate device from my phone but you're totally right that it is a viable option.
Are you under 40? Sooner or later your eyes are going to get bad and the teeny tiny fonts most printed books use are going to become hard to read even with glasses. In the bad old days there were a subset of books published in large type but with an e-reader you can adjust the font size of any book to where it is comfortable to you.