So it's not so much about whether a given tech works for your project or not (being honest, server-side rendering + dash of jQuery is probably more than adequate for a lot of sites going full-on React+Redux right now) but fear of your skills becoming obsolete. Given the shit-show hiring is right now with its resume filtering and whiteboard hazing (witness every other week on HN) that's not an unfounded fear. So in order to have something on our resume that we used React in our last job, we use React for our current project...and so contribute to the problem.