I think it depends on what you're doing. I'd argue statically typed Python (ie. with type hints) is also good for an early-prototype language and has the benefit of being able to swap out parts at a time via C FFI with Rust or something like PyO3. Pypy with asyncio (so FastAPI?) is what I'd choose for a web framework these days, personally.
I agree; Python is a great choice especially if whatever you're building is heavy in math and/or ML. The ecosystem is just better so it makes sense then to build your backend stack with Python.
