My problem with promises is that delivering it without async/await is just awkward. Because, yes, in the ES7 async/await world, you're going to want to use prom

My problem with promises is that delivering it without async/await is just awkward. Because, yes, in the ES7 async/await world, you're going to want to use promises heavily because they'll work so great with that. But in the ES6 world, making your API promise-based makes it heavier-feeling and more awkward than simple, clean callbacks. (Which get an unnecessarily bad rap from people who don't work primarily in JS; there are cases when callbacks get awkward, but just looking at code that's four levels of indent deep and declaring it "callback hell" -- as you so frequently see -- is a super-shallow analysis. That code is clean and easy to understand, as often as not.)