"While it is true that many of the functions not provided by Backbone itself could be filled by third-party plugins, this also means that there are many choices to be made when creating an application, as many functions have several alternative plugins. For example, nested models can be provided by Backbone.DocumentModel, BackBone.NestedTypes, Backbone.Schema, Backbone-Nested, backbone-nestify, just to name a few. Deciding which one is the best for your project requires research, which in turn takes time - and one of the main purposes of framework is to save you time.
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WordPress is by far the leading CMS that powers more 50% of all sites across the web. The whole eco-systems of thousands of plug-ins, availability of resources and ease of use for technical/non-technical users have made it popular content management system.