Maybe they don't "need" one, but they have contributed in a very meaningful way to the web dev community so I feel that this is a harsh take. Check out Lottie, Mavericks, and their contributions to the React ecosystem.
You're asking the wrong guy; I consider React one of the worst mistakes in technology, and it's the main reason Airbnb's website sucks (I speak as a superhost who has to use the thing a lot).
