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.
Ah shit I think you are right. Feels like I have had it forever but seems that was a false memory of some sort.
I bought it while I lived in my previous apartment which I feel was longer ago and so I got a bit confused with the dates I think lol. Thanks for pointing it out.