> F# async will not prevent you from causing data races.

That's true regarding side-effects and mutable data, but I wasn't saying that. It's still a much more sane and actually concurrent and asynchronous library than Python's asyncio, which is not actually concurrent, single threaded, and very difficult to work with. For example, there's nonway to laumch an asynchronous process and then later await it from synchronous code, whereas it's easy in F#.