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Kindle really isn't closed and limited if you use it with Calibre. I've never downloaded a book directly onto my Kindle PW2 - the only time it was ever connected to wifi was to register it, years ago. Everything on the device, hundreds of books, has been side loaded via Calibre. That includes many converted epubs from many sources.
I've not found it any more "closed and limited" than Kobo.
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