I'm not sure publishers ever really did spend that much time proofreading reprinted books because prior to ebooks, a publisher often just had a paperback of the original for reference and would photograph its pages and print them rather than setting some underling to retyping and resetting the whole thing. You can tell by looking at some reprinted books - say, sf novels from the Fifties and Sixties - where the print looks a little heavy and thick. That's because you're effectively reading a photocopy.
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