No, it means that there's a way things are usually done, but if, in you situation, a different way works better, you are free to use it without having to fight the framework.
The Ember team is one of the least dogmatic teams that I have come across, and has been willing to change their entire strategy when presented with a better idea (while providing a well defined and fairly convenient upgrade path).
I still remember when React first came out, and showed how one way binding was so much better than 2 way bindings, and the Ember team was able to quickly switch to this new philosophy via DDAU, while still providing an easy upgrade path for our code. And all this was before 1.0 if I remember correctly.
I'm confused, ember uses standard js imports as well so what's the difference?