Australia invented the winged keel to circumvent the America's Cup draft limits. Volume boat builders glommed on to this as a gimmick for " wannabe racers". Now it is a permanent fixture in boat sales.The purpose of the winged keel was to keep the underwater foil engaged in the flow and the boat on it's feet (upright) so that the sails can lift the boat to windward. The winged keel is a foil aspect multiplier. Everything is a compromise, including the value of your desire to boat into shoal water.