I have plenty of other devices so I'm not (yet) locked out of my library, and those Macs can be converted to Windows 10 (which does run the latest Kindle software)... but it reminded me it isn't a forever library. I need to make non-DRM'd archive copies of all my digital books if I want to be able to use them for more than 4 to 5 years.
well, it seems you can't even read them now.
Also, it drives me mad that families have to have some weird hacky system to share ebooks - either have all ereaders use the same Amazon/Kobo/Whatever account, thus messing up any recommendations, or DRM stripping, which is a pain.
The times I really want to read a book now the instant delivery is great, but I think there have only been 3 times in the something like 4 years that we've had an ereader in the house that I've wanted a book that badly and the ebook hasn't been available at a library.
Edit: I do wish physical books were searchable, and had a built-in dictionary.
That said, the page turn lag bugs me, too. It's better on tablets/phone.
(Unless maybe you're talking about one from 5 years or more ago?)