OK, I have a React-ion here…
Everything is awesome! Ember Awesome, React Awesome, Vue Awesome
But we picked Ember and are happy with our choice and do not see ourselves moving anywhere new any time soon.
Well… I can help here. If you want to hack on Discourse, learn Ember! There is a very lively community with tons of resources. If you do not want to hack on Discourse … well this is not the place to be discussing this 