This is why I'm learning Rust: C# gives fast development speeds than Python with decent performance. Python and Go for when their native libraries smoke C# and now Rust for performance or low level.
Smoke as in have better support for specific (niche) use cases. Python has strong numeric libraries and Go has better support for modern/interesting/crazy cryptography systems than C#/Java.
So in reality there are very few places where you would want to use Go over modern C#.