Airmann
while not necessarily directly addressing your question, I found this discussion below one of the more thought provoking on the general use of weather radar
https://forums.jetcareers.com/thread...hniques.35839/
There is some discussion on page 1 on Archie Trammel’s advice (radar guru, recently passed away), and further on some actual input from the great Dave Gwinn (even more radar guru, also passed away unfortunately).
It may may help you to decide if people going under red on final are riding their luck or actually making a reasonable judgment.