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I've seen a lot of scanned books in my life.
Frankly, I would rather type them by hand than to correct their spelling mistakes and/or paginations.
I believe a lot of the people that answered are English natives. Well, any OCR software can be trained to recognize 26 letters, but to non-ASCII users (like Bangla above) the errors a ten fold increased. For diacritics, it even be that scanning errors (like random black dots) may create a new character.
A good example of my opinion can be found in archive.org. Compare the PDF (scanned but a text layer) and the EPUB files.
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