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There are multiple ways to do annotation on a PDF, not all of which involve images.
It will be interesting to see which technique(s) the Kindle Scribe uses.
I don't see the argument that PDFs aren't "real" books --- they allow pagination, and typesetting and line breaks which can be optimized and controlled in a way which other ebook formats can't, but that's a different discussion and off-topic for this thread.
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