And even those who receive just a standard "Meets Expectations" rating receive sufficient refreshers that there isn't that big a cliff after four years either. It may go from something like $500k to $450k.

There's a lot of jumping around at the 3-year mark, especially for people who want to cash in their FAANG brand for a similar package somewhere else. But once you get to E5 and higher there is significant financial incentive to stay with FB for longer than the initial four years.