I think this is a reasonable API, but ES is not the spec for it. ES does not 
have a proper concept of an event loop, and definitely not a proper concept of 
time. Note that setTimeout is not defined in ES, but instead in HTML: 
https://html.spec.whatwg.org/#dom-windowtimers-settimeout

It might be worth proposing this at https://github.com/whatwg/html/issues; the 
form would probably be a new global function.

However, the biggest problem with such proposals is that they lack a way to 
clear the timeout. That is waiting for cancelable promises to arrive, which I 
am working on but I anticipate being contentious due to many differing opinions 
on the best way to do them.

So my best guess is that if you did propose this to HTML people would shout it 
down on the basis of not being able to cancel the timeout, and you'd have to 
wait until we figure out cancelable promises. But it's probably worth trying 
anyway.

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