The investment to become fluent in Go might literally be an order of magnitude less than becoming fluent in rust.
Rust might be the perfect language in terms of capabilities and safety, but it is far from a simple language.
The function signatures from even some simple methods have become ridiculous. I’ve seen enough examples where it was needed to unpack a value two or three times to get the value you want.
The perfect language probably doesn’t exist, but go is one of the easiest compiled and strongly typed languages to learn. And that in itself is quite an achievement.