A note of caution that this is not the common Facebook experience. I joined being fully aware of their reputation for poor work life balance, but even then it was soul-crushing. The pressure to perform is near constant, consequences of not performing are real, and the bar for meeting expectations is very high to start with, such that externally hired senior engineers are frequently overwhelmed by the sheer amount of expectations.
I was a manager there and got the distinct impression that the expectations bar was also rising over time. FB/Meta tends to hire the overperforming types, who put extra pressure on themselves to get those Exceeds and Greatly Exceeds ratings that come with real monetary rewards. The problem is you can't have everyone exceeding, not at the macro level anyways. So there's a real pressure on the managers with too many of those Exceeds ratings. The goal is to prevent a manager that misunderstands the expectations from giving everyone Exceeds, but the side effect is that over time there is a drift of expectations from Exceeds to Meets side. Having been with the company for so many years, the author likely did not notice this drift and was able to adjust over time naturally. Newer hires (which, given FB's rate of growth, is the large majority) aren't so lucky.