Who needs software updates and Bezos's spying.
We have several different ecosystem e-readers in our household and all are used via USB and Calibre. The "extra time used" is won by multitude with approach where the reading stays in the center and uploading is once in a while event.
This creates a barrier for addictive bookshopping, though a reader with plenty of books allows the change of minds, not just the endless booscrrolling that a connected device enables.