Keep pulling the thread on Guillermo Rauch.
The programming model enabled by React, which defines UI as a pure function of state, relieves programmers from the burden of specifying UI transitions over time.
Artboards, initially introduced by Adobe Illustrator and popularized by Sketch, became the de-facto standard for designing UIs for varying screen sizes, leading to their adoption in Adobe Photoshop.
With imperative UI approaches like those used with jQuery, confidently determining the correctness and completeness of an implementation requires actually executing the code for all logical branches.
The value of a library like React is better understood by examining the programming model it imposes, rather than by comparing its specific features to other libraries.