I already lived through the home-rolled, pure-js, custom frontend "frameworks" made by each team's resident "smart guy" once. I shudder just thinking about those days.
React/Angular/framework-whatever are glorious angels protecting us from the tyranny of half-baked, poorly thought out approaches to frontend development.
You don't educate developers to good practices just by abstracting the hard things. You don't need to use React/Angular/Whatever to manage state the right way in a front-end application. You don't need a framework to make code maintainable or testable, or you're just saying front-end developers are so incompetent and undisciplined they need a framework. No they don't, just like one doesn't need a framework like Rails or Spring or Django to write a server app.
> React/Angular/framework-whatever are glorious angels protecting us from the tyranny of half-baked, poorly thought out approaches to frontend development.
No they are not, they are making the developer ignorant of the underlying DOM architecture.