I think the incorrect premise here was that engineers always know what a good product is. :) And I say that as an engineer myself. It's fully possible that the whole team was aligned on a product idea that was bad, it happens all the time. From my experience though, if there's any company where engineers don't just mindlessly follow the PMs and have a lot of agency to set direction, it's Meta. Might differ between orgs but generally that was my experience.
