I've talked at length with Malcolm McBride about this. The LAA conducted an investigation following G-MYES and the fact that they have taken no across-the-board action speaks for itself. The investigation is now largely concluded though there will be other associated work.
LAA found no single factor and instead there were many varied (and often complex) reasons for each accident, not directly related to the Rans itself. There was one theme of some owners flying overweight and not respecting the aeroplane's performance as a result but that's not a Rans problem! LAA have addressed the cultural and pilotage issues that were raised. In short, LAA were satisfied there was no specific problem with the S6.