For me, it boils down to, "Why should I switch for clunkier syntax and not even feature parity with CoffeeScript?" This is a personal choice though and I'm glad that babel is available to the people that want it. That's what is awesome about Atom, you can have it your way
Fair Warning: If this topic starts turning into an extension of Why CoffeeScript?, I'm going to have to close it. Language wars don't belong on Discuss.