I left them out because many others have blogged about the same reasons. But this is the biggest reason: We have a lot of complexity in our view/component laye

I left them out because many others have blogged about the same reasons. But this is the biggest reason: We have a lot of complexity in our view/component layer where we trying to bring simple workflows to very complicated technical features. Backbone (even with Marionette) doesn't have a strong view composition story, essentially avoiding setting up any patterns. React's composition pattern is so strong that its hard not to abstract things. The complexity is still there but its easy to follow and extremely simple to test (especially with redux). There are more reasons, but I have to go now. Hopefully that suffices