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Been using an Onyx Boox Nova 3 for maybe 8 years now. It runs android, drm free everything (edit: it has no store really, it is basically empty. Supports virtually any filetype you can read. Epub, pdf, mobi, cbz). For some android could be a distraction from reading, but the browser is slow enough to were you use it to hop on annas-archive, get a book and then quickly close it. File transfer via shared wifi or USB, good reader, some nice reading stats without needing any account. Recommend if anyone wants to jump the amazon ship.
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.