I made the mistake of buying a 2024 Gen 12 kindle. It's nicer than my old refurb'ed Gen 11, faster, bigger, with more storage. But Amazon has taken away the "I'm a disk" feature and I have to use their MacOS app to copy files to/from it via USB or Wifi. Also, Kindle books I bought stay on Amazon's servers and aren't downloaded to the device. My old stuff can be copied over and accessed, but if I want to jailbrake the DRM on the 200 books I bought from Amazon, I'm SOL right now.
I have to decide to stop reading the authors that only publish on Amazon and send the Kindle back to Amazon for a refund to get something else. I shoulda known better.