The TAG is going to ask you about "user needs"

[domenic]

See, e.g., this sort of exchange: w3ctag/design-reviews#760 (comment)

I don't know what the correct answer is here, personally. Maybe just mention that like things such as promises or EventTarget, this enables developers to build websites (particularly ones involving repeated events, which are a common pattern as you can see from ... all web specs ever). And users like websites.