RRNC I have seen the City of Guelph, Ontario, Canada implement a very effective RRNC program. It had builder hick-ups at the start but people were learning. Many of the problems I see professionals point out about are 100% valid and I agree wholeheartedly. The root cause of the issue is that the Building Authority can only enforce Building Code. If Building Code (or other legislation) does not make testing mandatory then builders won't do it. If code allows for poor quality and improper installation because it is unclear or incorrect then these issues will continue. Legislative changes take time and are under political influence. If we, and the government in power want occupant safety and a healthy community legislation must change.
I understand the frustration. What keeps me going is the positive fact that radon is being discussed more often which leads to better public awareness. If you have 55% failure in builder pipe then you have 45% success which is more than 0% anything like we had ten years ago.
I do agree that there are short comings to RRNC and unskilled trades and ill informed people are among the main reasons for poor results. We are here to sort those out.