Why do a lot of developers not use EmberJS? Are there any perks that we need to know about? I have been using it, and it's been good so far.

I have been using Ember for a while now, and the framework looks so good and since my recent backend is rails, ember-data just fits in.

But in a lot of polls, Ember seems like its outdated and should not be used for apps while React/Angular even Vue that came in recently takes the glory of awesome Javascript frameworks.

What are the pros and cons of using Ember?