Saw some pics of XL2 and a sistership - Wahoo.
XL2 has had some serious work done on her and the rig has had some work - maybe taller mast or bigger sails. I remember her hull getting light in about 15-18 knots upwind so she has a pretty high power to weight ratio. You can see her windward hull getting light in what looks like a nice, but not terribly breezy day.
Compare her with the initial rig that the designer Lock Crowther, put on his sistership - Wahoo - to comply with the pretty rigorous IOMR rules in the 80s. A much smaller rig, safer but slower.

It's not multihull rocket science. If you put bigger rigs on boats, you have to be more careful. Cruisers have more weight and less rig, and sail slower.