[pornel]

People complain about Rust using so many small crates, but it's actually its strength: those small focused single-purpose crates are easier to review, test, and fuzz.

You don't need to answer a question of "is my 1-million-line codebase safe?", but rather "does this 10-line function uphold Rust's invariants?". It may be a tricky question, but you can focus on it in isolation. The contract between crates is safe, so once you've proven the dependency upholds the contract, you can rely on all its usages being safe.