Not only that, but the "promo packet" and "promo committee" is fairly unique to Google. Other companies do things very differently, e.g. FB's twice-yearly (now yearly) manager-driven PSC+"calibration" cycle, which has fairly different incentives than Google-style committees of unknown engineering peers with arbitrary periodization.
Google's system is well known (at least, in my circle of colleagues!) to not promote healthy long-term maintainership, although it does incentivize point-in-time brilliance and solving deep complexity.
Google's system is well known (at least, in my circle of colleagues!) to not promote healthy long-term maintainership, although it does incentivize point-in-time brilliance and solving deep complexity.