As someone who worked in an environment with high expectations for number of posts (2–3 a day, and this was my second job), I eventually burned out. Some of it was the work hours but a lot of it was existential. I really got better at being faster but I really wasn’t convinced I was doing more than just “churn.” For example “aggregating” posts that were really posts about another article and added nothing to the conversation.
I burned out so hard that I pretty much stopped writing and focused more on my IT career (another type of career infamous for burnout). One thing I think from that perspective is that eventually the places feeding the churn factory like Facebook and Twitter will find ways to filter lower quality content out (short “hot takes”, aggregation, low-quality listicles), and it will damage the business models of publications that depend on them.