The top one should always be on top is "keep up with standard JS", it's rapidly approaching what could be considered a sane standard library. Once the specific

The top one should always be on top is "keep up with standard JS", it's rapidly approaching what could be considered a sane standard library. Once the specification for web components is finished, standard JavaScript plus Babel (and polyfills) would be all that's needed to build 95% of web apps.