Anduril President Matthew Steckman says there are two red flags for new defense companies: not realizing that what they're doing already exists, and an overestimation of TAM: "There's too much hubris in the technology market that, as high-tech people, we can do everything better than everybody else. I think that causes some companies to think they have an idea that isn't actually an idea—because it already exists." "I think there's in many cases an overestimation of addressable market…