Suddenly I found myself being able to organise my library how I wanted (through the use of folders, like any directory). Very easy to manage.
Also it made it super easy to send books without having to rely on the cable.
Ultimately, it was the hardware of the device that made me look for an alternative. I just couldn't stand micro USB charging in 2023. So I bought a Kobo and later on a palma (for the form factor).
Being able to install Koreader has now become a feature I select for. Also, it's very easy to sync books in Koreader, if your device is always online you can do it automatically or the way I do it is with some swipe gestures to push and pull the progress.