This has been a very useful thread, and is a reminder of why I started on, and remain on, Mobileread.
I'll just add that as others have said here that I have a Kindle Paperwhite SE (2021), and can still 'download and transfer to usb' from the Content page. I bought a book on Jan 15 which had been published on Jan 9, and it was still available to download in Azw3 format.
As soon as this stops being the case, I'll go elsewhere, as fiddling with formatting in Calibre to make my ebooks as close as possible to pbooks in presentation (no spacing between paragraphs, justified text) is my one non-negotiable.
Anyway, just my 2 pence.
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