The only issue that would matter was the books I hadn't read--and if I changed readers from a Kindle to ePUB.
I don't have family members to share with (my mom reads, but not the same things I do. My nephew might someday want a book or two from my collection, but that's a maybe.)
It is, however, a valid concern and a fair one. Books should last longer than the device they are sold on/with. A standard format (epub or kindle or devices that support both) would go a long way to solving the problem, I think.
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