@pakman (first post, long time reader) I can't speak to super rugby, but the wife is an international umpire for field hockey. They have an umpire manager and multiple technical officials that at half time will have a huddle and between the two umpires on the field and the UM will discuss relevant issues, trends, and themes etc. After the game the umpires get a debrief, and a scorecard on performance etc. Fitness right through to individual calls and game management etc. So if for amateur hockey this is happening at the regional tournament and international evel. I would be very surprised its not happening at the super level.
Not union but at a recent hockey international tournament in Sydney. The NRL ref's and the hockey umpires had several get togethers and did some cross pollination on practices and processes. Some mentoring both ways is occurring as well.
I know that the union commentary team have access to the ref's prior and after games as well to discuss things. So the belligerence of certain commentators about the rules is an "act".