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The main difference between rust futures and JS promises is that rust futures don't get scheduled if you don't poll them (we high await does under the hood). Promises otoh get to run immediately and can run to completion even if you never touch the promise ever againt

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You get the same with e.g. tokio::spawn, which runs the future concurrently and returns something that you can await and get the future's output. Or you can forget that something and the future will still run to completion.

Directly awaiting a future gives you more control, in a sense, as you can defer things until they're actually needed.

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