I think we all agree that future chaining isn't great surface API in the long-term, but we have a pretty good idea of how to desugar async/await to the futures

I think we all agree that future chaining isn't great surface API in the long-term, but we have a pretty good idea of how to desugar async/await to the futures we have. That's why we're build the runtime around them; because they're fast and they will (someday) have a relatively convenient API.