I hear that it’s quite possible to jailbreak your kindle these days, and that sounds super cool.
But a lot of e-Readers tend to be quite expensive. Why would you purchase an e-Reader if you already have your phone? Even if you didn’t, your average phone is still gonna be cheaper than an e-Reader. Depending on the phone you’ll get, it’s also more durable and portable, probably even waterproof. Phones also tend to have more storage than ereaders. They even come with color. (I know color e-Readers exist, but they’re even MORE expensive, and they also come with their own issues that black-n-white e-Readers don’t have.)
Yeah, eReaders have more battery life than phones, and they’re also easier on the eyes. But overall, why buy an e-Reader to jailbreak if you already have a phone?
For me:
Better aspect ratio for large amounts of text. I just can’t imagine reading an entire novel on my phone.
No distractions. No notifications, no other apps I could be using instead.
Related to the previous point - e-readers are for reading. I’m much more likely to read a lot if I can compartmentalise “other stuff” to my phone. Not to mention other features like the ability to look up word meanings and change text size - all stuff in service of e-readers being “for reading”. (There might exist phone apps that can do this sort of thing, but my point is that on an e-reader it’s built-in).
Page-turn buttons instead of a touch screen (depends on the e-reader). This is a minor thing, but it lessens fingerprints, which makes the screen nicer to use.