Kindle is worse for export.
What are you learning and why is it needed on another app/ereader?
Calibre and Kobo Built in menu option DO export highlight, annotation, position etc. Possible with Kindle to.
Some put it in a Calibre column. Some people copy/paste to a text file.
Sync and export are different. I find zero value in sync and great value with export.
Send To Kindle is very limited and insecure. Limited in format and size. Insecure because Amazon gets a copy forever. It needs the Internet TWICE.
I only use the internet once with ebooks, to save on computer and backup and import to Calibre.
The Kindles & Kobos don't get connected to Internet.
My phones & Tablets only get ebooks via Calibre. Internet usage on them is never ebook related except for local public library (I hardly use it as my TBR pile is huge).
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