Thanks — but my Kindle (an Oasis, 2d generation) works just fine with Apprentice Alf’s tools on a Mac running Catalina. Maybe I’m just unclear on what you mean by “directly work.”
I’ve got the plugin configured in Calibre. Then I just download the file from Amazon for transfer via USB, drop those files into Calibre, and I’m good to go.
A Kindle is my normal reading device, so there’s not a lot of practical difference for me in whether my Kindle books are deDRMed, but I want the freedom to move to another device for personal use of my purchased books if I ever decide to do that. So what’s on my Kindle is probably a mix of books with and without DRM.
A side note: My first ereader was a Nook, and getting those purchased books to my Kindle was the primary practical reason for getting into Apprentice Alf’s tools. Getting the BN plugin working was quite a saga, and much tricker than getting the Amazon plugin working. It involved Android Studio and a virtual device…