Yes, there are some edge cases, but the reality is, I've seen code festooned with Promises, and code using async/await, and I find the async/await code far more

Yes, there are some edge cases, but the reality is, I've seen code festooned with Promises, and code using async/await, and I find the async/await code far more readable. You could make a similar argument that Promises are insufficient, and you should really be using Observables, because there are lots of situations where the generality is even better. On the other hand, there's no universal hammer, and no reason why you can't mix all approaches, choosing each where it works best.