> Do any of these frameworks actually solve problems that weren't being solved before? Yes. React solved two big problems in the front-end space: building re-u

> Do any of these frameworks actually solve problems that weren't being solved before? Yes. React solved two big problems in the front-end space: building re-usable components as a first order concern and moving away from the imperative DOM. As mentioned, Vue is arguably pretty similar except with some concretely different goals. Angular 1 -> 2 was not about just Typescript, it was a large-scale refactoring to move away from some of the more imperative aspects towards a more component-based architecture which incorporates some of the advances made since Angular 1 was introduced. Vulcan's a framework which uses React and Meteor is it's own separate thing so I'm not sure what you're trying to identify here.