> Americans tend to be enthusiastic about their company mission - in the extreme, believing that they’re saving the world I would explain this as commitment signaling. I don’t know if they really believe it, but they want to show they are part of the team and the talking points. Adults use language in a less literal way than introverted engineers may be comfortable with.
How condescending. "Adults" in other regions often do not have the facade of overenthusiasm that America/SV specifically has. It is a cultural quirk, not something specific to if someone's an introverted engineer or not.
I've worked for SV companies as an outsider as well, and it was immediately noticeable. It was like everyone had a gun to their back and were being asked to say "I love the company!". It reminded me of a Japanese company, except without the deeper authenticity granted by older social protocols.