Amazon don't support epub on Kindles even though it's used as the source for publishing via KDP and for "Send to Kindle".
Kindles are poorly supported on Calibre, less well than they used to be, due to Amazon's semi-walled garden approach and locked down nature. Collections, Series and Annotations are rubbish compared to a Kobo. I've used both for years.
Written notes on epub on any platform are useless for the proof/edit cycle. I only use the separate Advanced Notebooks on Sage and Elipsa for converted handwriting. The onscreen keyboard (or a BT keyboard is possible on some models) is the only useful way to annotate epubs on Sony (obsolete ereaders), Boyue/Meebook, Pocketbook, Boox, Kobo and Kindles. Only the Kobo is really good for PC integration of the annotation, Mac, Windows or Linux via Kobo Utilities on Calibre.
Either wait for real reviews here (not hype on goodereader or gizmodo etc) or get an 8" Kobo Sage for epub (type annotations), and separate notebooks (use MS Surface compatible "Adrawpen"). The Elipsa is lighter than the Kindle scribe and too heavy for notes.
The Scribe might be a good choice for PDFs, but any annotation export of those is likely PDF/Image only.
Wait and see.
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