Another important consideration is the non-contest pilot. Perhaps someone flying out of a nearby airport will be in some of the same airspace as the contest pilots. These pilots flying with Flarm have purchased a Flarm with the expectation of more situational awareness. Now they encounter a mass of sailplanes flying with Farm limited by stealth mode. By mandating stealth you have essentially taken some of the situational awareness thus safety from a pilot that has not agreed to these conditions.