Battery on my e-reader lasts months, no distractions/alerts, it's a bigger screen so I can use a increased size font without destroying the layout, I can load a few GB on there without taking space from apps on my phone, and more comfortable to hold for long periods especially if I've been on the phone often that day already. Phone is a pixel 5, e-reader is a Kindle 6.8", and I have a cheap old 10" tablet for reading comics and scientific papers, but I haven't been using that as much for comics since Amazon killed comixology.