Python: I get how PyPy is better in some ways, but calling C libs is the most important feature of Python. It doesn't have a lot going for it otherwise.

Go: Greenthreading is a big deal in backends. Arguably the main reason for Kotlin is because Java didn't have that, but now there are vthreads. Rust has chipped away at the Go systems use cases, so it's mainly for backends and CLIs now, but I wish it had better error handling.

Rust: There's a very good preso from the Rust team about how they arrived at async/await, and also how every other language does concurrency. Greenthreading was considered, main problem being you need a runtime for that.

C++: Torvalds was right about it all along.

JS: Honestly the best high-level language, made better choices than Python, never made huge breaking changes, somehow had a decent answer to cooperative multitasking before most other langs, deserves its popularity.