I kind of resent the idea that everybody who works (and reads and writes) fast is necessarily a hack. I’d never say anybody who works slowly is a hack. Or anything but a person who works at the pace that suits them best.
Criticize the quality of the product, by all means. But who cares about one’s process of getting there? If I churn out text while hanging upside down on the chandelier while whistling the national anthem of Togo, so what? Is my writing under-researched or poorly written? If not, then why is it a problem how I write it and how long it gets me?