In the backend you wait for databases, caches, external APIs and so on. Rust wouldn't be a major performance win over any strongly typed, compiled, garbage coll

In the backend you wait for databases, caches, external APIs and so on. Rust wouldn't be a major performance win over any strongly typed, compiled, garbage collected language. But it would mean lower development speed in a world where time to market is important. If top raw performance was so important in the backend, people would have used C++ long before Rust became popular. Now you might have a rare use case where raw performance is important, but in that case you write that part in a low level language and the rest of the microservices in a more productive one.