The problem with any system is that it can get you into trouble. In the case of the Staffs incident see and avoid worked, the vintage machine turned to miss the micro and that put it into the path of the turboprop. I think this could happen with any system. If you also consider formation mid airs and Gliders you will never get to zero. The FLARM system could offer valuable assistance, but why not try to get the various bodies to recommend it initially?
Rod1