Silicon Valley loves to preach the gospel of lean teams. But Google's vice president of product said that mentality can kill great ideas. Robby Stein said on an episode of "Lenny's Podcast" published Saturday, that there's a "cult of lean, scrappy, fast, throw away your product quickly" culture in the tech world. "At some level, it's true for internal conviction, but to build a product that works for a lot of people that is based on a technological breakthrough, a lot of times I see teams just