I think you know @mikeferguson figured it out http://www.robotandchisel.com/2020/08/10/rviz2-on-mac/
So have hope, my friends run ros2 foxy, rviz, et al. on catalina. There is no need for virtualbox. there’s a large number of committed macOS users. For example rmw_cyclonedds & cyclonedds is mostly developed in Xcode IDE on Catalina and that seems to be working ok for people https://iot.eclipse.org/adopters/#iot.cyclonedds
Your testing, feedback and PRs would help us all get ros2 and the nightly CI updated for Catalina
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