A more generous interpretation would be that if you have a communal library, rather than everyone having their own individual libraries, it's easier to vet it for correctness. Rust takes the communal approach. The parent was suggesting that every company has an insular library approach. NIH.
Many people that go off the beaten track often fall into the same ditch.
Correctness yes but what about other requirements people have such as performance, extended functionality, domain-specific optimizations, predictability, etc.
Third-party libraries were not born out of the thin air but because of different parties having different and very much often disjoint requirements so it's not particularly NIH syndrome.
Many people that go off the beaten track often fall into the same ditch.