[Cymen]

But how do you translate that into (short term) OKRs and work that engineers can build a career upon as an achievement (for promotion)? I think there is a cultural mismatch between how engineers grow and what they work on at Google versus the quality of the search results. There seems to be very limit upside and huge potential downside to working on this at Google.

That said, I don't work for Google and my conjecture is based on the hand wavy details (from engineers that do/have) posted online.