> By contrast, calling async code from sync code requires a special blocking wrapper (Python) ...
That's exaclty my point. If you don't have async by default in your platform you need to do stupid things to fake it. If function calls and main in Python were innately async you could be calling async code just as easily as sync code.
> [...] or unavoidably breaks control flow (JavaScript).
async/await syntax avoids it completely.
Tbh await should be default function call semantics and there should be special keyword for calling without awaiting. But since we come from sync primitives that would require small revolution that might happen at some point.
> Async is syntactic sugar
You could make sync code be syntactic sugar for await.
