Because we shouldn't punish new browsers with old code. Punish old browsers instead :).
To use it, add a script tag like this:
<script id=no-loader
data-legacy=/path/to/non-es6-version.js
data-timeout=60000
src=https://npmcdn.com/no-loader@latest/index.min.js></script>
Then insert your app's script tag pointing to the modern version of your code.
<script src=/path/to/es6-version.js></script>
See playground for an example.
License MIT. With <3 by UXtemple.