AngularJS is a good framework. However, it is six years old, and there are a lot of things that have changed in these six years in the web world. To accommodate all these modern happenings in AngularJS, it would have to undergo many changes in the existing implementation, and this made the Angular team write AngularJS from scratch.

At the ngEurope conference held in October 2014, Angular 2 was announced as a massive update to Angular 1 for building complex web applications. The ngCommunity was a little upset as they invested a lot of time in learning and implementing Angular 1, and now they had to redo the process of learning and implementing Angular again. However, Google invested a lot in the migration and upgrade process from Angular 1 to 2 by introducing ngUpgrade and ngForward. Once the developers started learning and building products in Angular 2, they realized the power of cleaner, faster, and easier Angular 2.

Angular 2 was rewritten from scratch. It helped us write clean and testable code that can run on any device and platform. Angular 2 eliminated many concepts from Angular 1. Angular 2 follows the standardization of ECMAScript 2015. With the recent web standardization, the shadow DOM replaced transclusion and the ECMAScript 6 modules replaced Angular modules. Angular 2 is five times faster than Angular 1.x.