It's all about more lift. But once you are hiked out and the windward hull is out of the water, any additional lift is inefficient and requires managing (raising/lowering) the depth of your "longer" boards. With the F16's powerful sailplan, they already lift pretty quickly (especially solo) with the up-until-now "factory" standard depth.

Only time I've heard about the Taipan style (wide) daggers as being advantageous was during the starting sequence for non-pros (slow manuevering).

No first hand experience but from credible sources (resisting crude jokes).