The following is a (non-comprehensive) list of reasons to say that this tech is part of the Elastic Technologies family. Please, be aware that it can be changed anytime, adding new reasons found as we continue making intensive use of it.
Code maintainability = greater flexibility to design
Let developers make changes as designers is a big game-changer.
Everything is a component, so if you want a change buttons across the whole platform you only have to do it in one place and boom!
Fast prototypes not only give you more feedback opportunities but engage users and clients sooner.
Easily make native apps with React Native after using ReactJS for your website. Keeping designs homogeneous is a big thumb up for users.
A (very fast) growing community
Facebook+Instagram brains are behind it.