Some services don't belong in JSX though - this is why you have the idea of stores in Flux/Redux/etc. Some data doesn't make sense to couple to the component hierarchy - doing so makes it very easy to create dependencies on the component tree, which decreases modularity, as well as has perf ramifications by increasing the DOM elements that get rendered unnecessarily by React. Some examples are data models, routing, and interactions with non-element DOM api (window.location, XHR, etc.). This also has a side-effect of increasing difficulty of testing what generally should be vanilla constructs not tied to various frameworks/libraries unnecessarily.
