[eitally]

And at places like Google, this is how it does work (on paper. In practice there are always exceptions, either due to actual hierarchy or individual charisma). If you look at Google's org, you essentially have 4 ladders: 1) Engineering, 2) product management, 3) business, 4) G&A superstructure. You can bet that if you're a PM trying to decide roadmap priorities, you're going to be driven by input from engineers primarily, not customers, sales reps or professional managers.