You can speak for your own department. Some of us are shipping products and know what we're doing.
It's insane to think it would make sense to build on anything other than the best existing commercial technology and expect it to be reliable, affordable and maintainable. The military would not and should not change everything from Windows/Linux and Chrome to some completely custom OS and UI. (In the places we do provide products with the latter, we are more than state-of-the-art.)
Avionics have been piggybacking off of commercial electronics due to the sheer scale since at least the 1980's because it just makes sense, while the primes have been slow to do the same in software, partly due to mindsets like yours.
And the fact is, when creating software, everything starts out buggy, because nothing exists. That's why you develop, test and fix it. Normally we of course wouldn't ship anything that's not perfect, but our customers have begged us for products, saying they have nothing that can deal with some of the threats they face and so are okay with having to restart an app every now and then until it's ironed out.
Plus, if you can see through Anduril's marketing, how can you not see through China's marketing?