Systems programming is just the recommended domain.

Personally I think having a strong type system with an IDE that instantly tells you if the data is the right shape is very valuable when interacting with network interfaces.

In Python you either send the request at runtime and see what the server responds with, or you read the docs, both of which are at least 10x slower than an IDE telling you nearly instantly.

Rust's type system can represent null and polymorphic types quite well, both of which are quite common in JSON-like network interfaces.

Macros work well for code generation that is often used to convert a network api spec into code.

Of course you can do types and macros in Python, but neither are primary features of the language so are not as well supported.