Probably a higher risk of carby icing from taking the engine to idle than a mixture cut. In both situations the rpm is about the same, so the engines are pumping about the same amount of air ao the same temperature. For the minute or so that the engine is shut down the residual heat of the engine probably means the engine temps are pretty similar. But, at idle you still have the effect of evaporative cooling from the fuel spray in the carburetor cooling the carburetor venturi which doesn't exist if the mixture is cut.
Maybe there is an argument that mixture cuts are safer after all?