tl;dr: your yearly TC doesn't change much at these companies unless you get an actual raise. I don't fully understand the reasoning behind the four year schedule, but AIUI, it does not strongly incentivize sticking around for the full four years unless you assume significant stock appreciation.
If Google says they'll give you $200k per year in cash + $400k split over 4 years as RSUs, that's the same as just getting $300k per year in cash.
Why would you leave $300k per year in cash on the table? Because another company is offering you $350k per year (or more likely in the case of FAANG, another company is offering you the same $300k/yr but with significantly less stress).
Interesting. At my FAANG (Amazon) we explicitly are told to not ask this. It would be kind of weird for us to ask that, really, considering the tenure of most people here is <2 years.
It’s not; the RSUs are priced at grant, not at vest.
Plus there’s annual top-up grants.