[sergiotapia]

If I hadn't migrated to ES6, I would not have been able to use some javascript packages I enjoy. For example: https://github.com/JedWatson/react-select

[dalailambda]

There doesn't seem to be any part of that package that requires ES6 to use. You can use it as an ES6 module, but the commonjs version should work fine as well.

[tlrobinson]

You can transpile dependencies without migrating your whole app (though I'm not sure why you would)