The ease of updating Ember apps is really great. I've helped take apps through the early 2.x to latest 3.x. There has been some tedious work involved, but on the whole, I usually know exactly what to do to get the new features. Not breaking existing features is a godsend, because the rest of the team can keep developing features and we can introduce new features via lint rules at a reasonable pace.
This is neat to read. The README for the Ember.js repo (github.com/emberjs/ember.js) was updated recently too, and I feel like there's a lot more specific clarity about what Ember really has to offer, especially for folks who might not have considered it an option yet.