Always amuses me a bit when people say Kindles don’t support EPUB, since I’ve been stripping DRM from my books and storing them in Calibre (enabling transparent conversion between EPUB and Amazon’s formats) for thirteen years without a hitch. You should be doing this on any platform if you want to keep your books.
It’s beyond me why anyone who so much as knows what FOSS stands for wouldn’t do the same.
Kindles are great devices and they’re subsidised, so they’re cheap. It’s perfectly possible to use them on e.g. permanent airplane mode. You don’t even have to buy books from Amazon, if you use Calibre.
That said I’ll be going Kobo next time because I love buttons.