I went from Python to Rust to Go. Python I won’t spend long on, it’s problems are well documented. Rust, which I use wherever possible, just is not the right language for apis for me. Adding dependency injection through Boxed traits feels like you’re taking a performance hit just so you can test code. Also, I spent a couple hours on trying to get async traits to work with a mocking lib and gave up. Switched to Golang. It’s not without issues but for now I’m productive.