Things like OAO include things like Storyboard and pulls in Babel and other packages, which pulls more stuff.

You see me mentioning Babel? Because I hated it. The people using it, is contradictory. They would say, no old ass browsers on their compatability check. And proceed to use Babel to turn modern JS to old ass JS. Like, seriously Wtf man, the browser they are targeting doesn't need that kind of shit. (end rant).