Seems like they don’t work exactly the same as they used to, as they now use MTP instead of USB mass storage, but while annoying, it’s generally a pretty trivial fix and your OS may already use MTP devices with no trouble. It seems there may be some other knock-on effects with fonts not sideloading right and needing a Calibre plugin to make pagination work how it used to.

So yeah, it’s getting worse, but Amazon hasn’t figured out how to bring the hammer down yet.