Maybe DNSB means creating manually on the device rather than on Calibre and updating the ereader, which doesn't work on newer Kindles. I've given up on Kindle Collections since the DXG.
I agree you can have 10,000 ebooks and only 50 collections. This is why I like Kobo + Calibre. Everything works.
Managing collections where it's not supported by Calibre seems a disaster.
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