Based on the bugginess of Maps, Duo, Hangouts, Wear, Stadia, and other products, I would say that the poor engineering is almost as much a factor of these failures as the lack of business vision. After all, the product doesn't need to work well for the PM to get promoted. It just needs to exist.
Google is run by the engineers. You don't get to blame the MBAs for its failures.
Google is run by the engineers. You don't get to blame the MBAs for its failures.