>>>>Software is the only industry where you are asked to build systems that have never been built before but that are more complex than anything ever built in the history of "mature industries"
There are occasionally novel engineering projects. These will be millions of dollars and years over budget, and then will fail. All their "mature industry standards and procedures and certifications" wont' save them.
It's unwise to extrapolate the US defense industry's procurement problems onto the Russians and Chinese. There's reasonable evidence to suggest the Russian Kinzhal and Zircon hypersonic missiles are already Working As Designed, or fairly close to it.[1][2]
Anyone engineering hypersonic missiles would easily dispute that.[1] Or submarine-capable quantum communication systems.[2] [1]https://www.nytimes.com/2019/06/19/magazine/hypersonic-missi... [2]https://www.realcleardefense.com/2017/11/04/quantum_communic...