100% agree. In my (more or less extensive) experience missing cancellation is what bites you more. Not because Promises don‘t implement it (I worked a lot with

100% agree. In my (more or less extensive) experience missing cancellation is what bites you more. Not because Promises don‘t implement it (I worked a lot with bluebirds CancellablePromises a lot and… it’s not fun) but because there’s no unified, “standard” and “specced” way. AbortControllers (which are just abort tokens hidden as EventEmitters) are not that bad but we’ll have to wait a lot before all fetch implementation support it (I’m looking at you V8 and Safari!). I still don‘t understand why they didn’t called it CancelController since “abort” is such an overlodaded term. Also (still in my experience) cancellation is incredibly more complex than it could seem. You don‘t want to simply stop the synchronous propagation, you want to act on it! You resources to be freed, you want partially completed async process to rollback what has already been done. Not easy.