Rails never had that kind of relationship w/ Ember. Katz was both a Rails and Ember core dev, as well other Ember core devs had links to the Rails world so the

Rails never had that kind of relationship w/ Ember. Katz was both a Rails and Ember core dev, as well other Ember core devs had links to the Rails world so they are philosophically similar in a way... But it really is a one-way relationship. Rails itself now has webpack included as of 5.1+ and its implementation has integrations for React, Vue, Angular, and even Elm - but no Ember. I don't think the Rails core team is opposed to Ember insofar as they're just embracing what appear to be the most common or upcoming SPA frameworks/libs. Ember just never really broke out.