To add to the other links: we built this to primarily help make Ionic faster, and we target mobile and web. So, it has to work everywhere we run. Some browsers

To add to the other links: we built this to primarily help make Ionic faster, and we target mobile and web. So, it has to work everywhere we run. Some browsers require polyfills but still have improved performance making it worth it. Others, like iOS safari which is a major target for us, support it natively in 2017. The trend is more and more native support.