50 years ago, getting a published book was a laborious and costly task. No computers, no spell checkers, no MS word, no Lulu.com, no e-books, no kindle, and no second chance if the first run didn't sell worth a damn.
Today the opposite is true. Find a spelling error on page 23 of the eBook? Export new copy of the pdf and have the corrected version online in less than an hour. Kindle edition needs and updated cover? 5 minutes and it's all fixed.