its extremely unnecessary in ES6 w/ isomorphic-fetch and promises. In fact I much prefer what's happening in that area. Really this seems unnecessary. Async JS isn't that hard and ES6 has come a long way to solving the issues imo.
I kinda feel that a hard ES6 dependency goes against the philosophy of this tool, which is arguing for simple libraries that can be simply used for small projects without buildchain dependencies, etc.
Saying "Front-end javascript is too complex, let's go back to our progressive enhancement roots" in one breath and "Requires webpack and ES6" in another doesn't jive IMO.
