Having a startup delay because the cli is written in node is a non starter for me. Hurl is written in Rust and starts up incredibly fast. It looks nice though for those that want to stick with the JS ecosystem though.
I totally understand. I'm a big fan of Rust myself, but we decided to go with TypeScript so we could quicker iterate on ideas and introduce new features. Another reason is that our goal is to be a community-driven project and I think we both can agree that there are far more web developers using JS than any other programming language
Our workflow specs are open-source as well, so if anybody wants to contribute a compatible runner written in other language - you're welcome!