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Re:Case Study: Npm uses Rust for its CPU-bound bottlenecks [... by steveklabnik on Sunday March 03, 2019 @01:12PM (#19295834)
Reproducibility was a core concern for cargo. Your parent is incorrect. A lock file means that your dependencies are never updated unless you explicitly ask for an update.
Re:Case Study: Npm uses Rust for its CPU-bound bottlenecks [... by mitchty on Sunday March 03, 2019 @01:56PM (#19296089)
There is also cargo vendor to download the dependencies locally. I’m using just that at work to ensure builds without network access work.

Rust is no worse here than say Haskell with cabal or stack or Swift with whatever they were using I forgot or go for that matter.