You are comparing a view library (react) with a full framework (ember).
Ofc you are supposed to pull things together with react, that's exactly what's intended.
Compared to react, ember is: slow (1), more difficult to learn (2), has a much smaller community (3) and, most important aspect to me, has a huge footprint (4).
(I'm not against ember, it might have some nice aspects and features. It was really nice during the time when they released 1.0. But today I just think their are better options available)
But. When it comes to productivity (actually building something and maintaining it), I can achieve way more in Ember.