Programming languages are tools. Just like a hammer doesn't automatically make you a great carpenter, simply knowing Rust or C++ or Go or any other lang won't instantly make you a better developer. I am just saying
@nixCraft Go is a fairly simple language so you wouldn't learn much by learning it compared to JavaScript or Python, but for C/C++/Rust and other system programming languages, since you have to manage memory manually, you have to be aware of when memory is allocated, how much memory is needed for different data types, and overall how to build more memory-efficient programs. Which in turns makes you a better developer, because you'll be more aware of patterns that are wasting memory, even if you're using a language that doesn't ask you to manually manage it.
Similarly, someone who only codes in C will gain a lot by learning a functional programming language, because it makes you take a different approach on problem solving.