Gentle reminder that proprietary software harms your freedom and takes advantage of you [0]. Consider supporting devices based on FLOSS, like PineNote [1].
The latest kindles offer a terrible user experience compared to the original - the device has just become yet another way to force ads and shopping portals into people's faces.
Are there any e-readers which do offer a simple, minimalist interface? I've given up hope of finding a low-distraction alternative to an Android tablet for reading PDFs, but have never had the opportunity to try any e-ink devices other than Kindles and Remarkables (which are too expensive and seem like imminent abandonware given the backlash against their subscription model).
Kobo, they have a variety of sizes, have pretty minimal interface and work great. They also support overdrive for libraries.
https://www.kobo.com/ereaders
Boox and Kubo have nice readers. I have a Boox Poke and it's pretty nice e-ink that isn't too expensive. I personally just use a Kindle Fire 10 HD for reading though.
Music to my ears! I built an open source application for reading books and comics and mobi has been a huge pain as there aren't many libraries out there that support it, let alone that are cross platforms for all the architectures/OS I support.
[0] https://www.gnu.org/philosophy/free-software-even-more-impor...
[1] https://pine64.org/pinenote