I think it's fair that he included them. Following that logic, he would not have included Backbone, Ember, and jQuery as they are all slowly but surely losing adoption as time goes on.
Also, while AngularJS might be considered legacy by fans of Angular (2-8), let's remind ourselves that Angular 2 changed so much at a fundamental level that it might as well be considered another framework entirely. Vue.js is far more of an Angular continuation than Angular 2 ever was.
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