Comment by ericlippert

People are leaving. In droves. There has been a huge exodus of senior talent in the last year. Zuck mentioned that in an earnings call and rather than assigning himself any responsibility said that those people were unregretted attrition and lazy parasites who were just collecting a paycheck during the pandemic. (I am paraphrasing somewhat; you can look it up if you want his exact words.)

Regarding change from within -- that's what a team dedicated to improving decision making is for.