Google promotes people who ship successful projects. So your managers are all people who have previously shipped something that was well received.
So they are very sure of their ability to ship the next thing and their ability to choose what’s important. Amplify that each step further up you go.
My skip level was overall fairly levelheaded but had a wildly out of sync estimation on team inertia. (she got let go shortly after the layoffs from what I’ve heard). The further up the chain you got and it was clear that she was constantly getting pressure to ship.