[JoeD]

I favour general purpose devices IFF they're able to do the job to a level I'm happy with. For many things they are, but in some cases I end up with special purpose devices such as eInk reader, DSLR etc

I used to use a dedicate mp3 player, but the quality of most phones has caught up enough that I no longer use that outside of the odd recording via its optical inputs. For playback a general device covers enough.

Everyone has different levels of what they deem acceptable for any given task though so whether a general purpose or specific device is needed is really a pretty personal thing. Consider how many people who used to own digital cameras now just use their phone. The built in cameras have caught up far enough to be good enough for a large group of people, even though DSLR offers many more options and advantages, a lot don't need them.

Reading doesn't need to be either/or though. You can own a dedicated eInk device for most of your reading especially in bright sunlight, yet still use your phone for those moments when you're out and waiting around for something/one.