While the above bouquet of random monikers may excite the cutting-edge startup developer, try pitching such an amalgamation to management in an enterprise environment.
Inevitably, this week's fashionable web technologies will be supplanted by next week's fads. YUI was nice because it channeled the Borg in absorbing the good from multiple technologies while attempting to provide users with some form of a migration path, usually through its better-than-average documentation. YUI evolved. Many of the above technologies will be cut-and-run like the projects they supplanted last week.
Perhaps the answer to this industry's flightiness will be found in the increasing use of transpilers. Javascript, with its callback-heavy code reading like so much thread through so many needle-eyes, does not seem to engender longevity in its creations. A framework built around something like gopherjs may be more libel to grow and adapt rather than becoming yet another abandonware.