You have good points overall, but I'd say AngularJS did have mass adoption at a time - it was a great way to build web applications compared to the alternatives. React just came by and did even better.
And Dart may not have much of a standing on its own, but Flutter is one of the most popular frameworks for creating cross-platform applications right now.
And Dart may not have much of a standing on its own, but Flutter is one of the most popular frameworks for creating cross-platform applications right now.