There was an initial push to form a Rust focused working group for ROS when this project was first announced, but some were hesitant on whether such an initiative was needed.
I think the slow progress of Rust support for ROS is self evident that such efforts require a focused community to develop & maintain, and fostering such a community takes deliberate coordination and regular interactions to grow. I’ve just emailed Open Robotics about the founding of a Rust WG for ROS.