These devices have different uses. I have all of my Kindle content on my laptop and can read or study my books that way. I have a Kindle Fire and can do my email with it. However, typing on it is similar to the phone. I don't do that often because of how slow it is. I can, but don't take pictures with it. I do have a smart phone that crosses all of these platforms. I can put a couple of Kindle books on it at a time so I can read when I wait at various places. I can do email, etc. I like its features but I am not firmly attached to my phone at all times. I like my combination of devices but some functions are just better on specific ones.