Agile development promises faster “time-to-market”, considering simultaneously a better alignment of the products to customer requirements. And not least, it also offers a better quality. Therefore, it is not surprising that agile software development is widespread today.
A common prejudice concerning agile that was spread ca. 2010 was that it is not very structured and that you need not to document anything. And like any prejudice, it can hardly be removed and you can still hear it in 2018.