I've been using it with Flutter (mobile) for side projects and prototypes. I was disappointed that we chose React Native rather than Flutter for cross-platform mobile dev. The reason was Flutter's lack of exposure, maturity/tooling while being recognized as a better architecture not having the surface area of both its own framework and the native platforms' idiosyncracies.
Yes, however, at least in my social circle, they are not on HN to be vocal about it.