On February 26th, Kindle customers will lose the ability to download eBook purchases directly to their PC. If you want to switch to a rival eReader brand in the future, I suggest that you use the soon-to-be discontinued “Download and Transfer via USB” feature to archive your Kindle library.
E-paper devices with Android are usually way underpowered for the platform, easier to just use the phone for such things.
I think you are missing the point of using an e-ink device… I don’t think anyone would use one because of “how powerful” it is.
I don’t want to read for hours on end on my phone or computer. With this, I can turn backlight off and use a lamp, like a normal book. Better for my eyes and relaxing.
Also, having dedicated devices for certain activities will change how you interact with them when using them. If I read a book on my computer I am tempted to look things up, get some work done or play a game. This is just for leisurely reading, and so when I pick it up that is what I do with it.
If you read a lot (books, not documentation which requires looking things up) then it really is a lot better for your eyes and a better experience to use e-ink.