Too many unknowns is way too broad of a reason when it comes to JS. JS is already the language of unknowns. It really depends on the framework, timing of things

Too many unknowns is way too broad of a reason when it comes to JS. JS is already the language of unknowns. It really depends on the framework, timing of things, people behind it. Angular is by Google, but also Google is pushing Web Components at the same time, which can integrate with Angular 2, but it challenges it as well. Also with Angular 2's goals being known for a long time, anyone could tell that ES6 would be a dramatic wave of change to the framework. With JS, all the frameworks and libraries out there are just a few years old. Angular is about 5 years old, but Google doesn't even use Angular in their sites, which should be extremely telling (along with the complexity learning and figuring out the API). In fact I think Google isn't even planning on Angular on any Google sites in the future. They are waiting until Web Components are finalized. With React, it is apparently mature enough, it is used on Facebook (1 billion users), Instagram (a child company of Facebook, like Youtube for Google), Khan Academy, Github (github issue viewer), AirBnB, CloudFlare, and a lot more: https://github.com/facebook/react/wiki/Sites-Using-React https://github.com/facebook/react/wiki/Sites-Using-React In the JS world, there's a lot of reason to keep moving forward with tech. Sure it doesn't have to be the latest and greatest, but since JS is such a "poor" language, a lot of these newer tools, features, framework, and libraries help build more professional, quality code. Shying away from newer tech (again not the latest and greatest, but away from tech that improves quality of code) highlights obstinance and ignorance about the technology behind it, as well as how little someone understands the industry today.