It's probably not called deckle edge, and I don't know if it's still done, but at least well into the 1970s many paperback books published in Denmark had the pages uncut. The folds were perforated, but you had to slit the edges yourself to read the book. I have at least one book from 1973 that has never been read, as all the pages are still uncut.
It leaves pages of slightly different sizes, making it difficult to thumb through the book. But I guess it could be a useful bookmark mechanism if you do the slitting as you read.
I assume it was done to save on costs.
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