[mmartinson]

It's still a moving target though. Either you transpile, and your target is just a config option, or you are in the business of being super selective about which "official" language features are ok to use for your user base. I can't imagine the business case for anything but write-anything, transpileto whatever the lowest common denominator of the day may be. Outside of one-off scripts, I don't imagine many browsers actually will be running any these new ES features until they become a compile target themselves in 8 years.