> Rust is expensive to develop - if you can afford to use a GC, you should use a GC

This has not been the case for many people using Rust, including myself. Once you learn the language, there is no "cost" to use it. In fact, the compiler simplifies much of the mental overhead when dealing with concurrency, sharing data, mutability, etc... Sure the compiler has some strict rules, but it's not expensive to develop in by any means.

I would also say Rust is in a sense higher-level than Go in terms of expressiveness and abstractions.