Are you just trying to pick a fight? Name another class that has, in four years, gone from nothing to nearly 40 boats on the line for a NA event? "Sort of took off"?... I don't think so.

As Trey pointed out - spin on a boomless rig is no big deal. The 6.0NA has a positive mast rotator with or without a chute...it's something you would have to deal with anyway but you don't have a rotation limiter like on a boom rig so it's pretty much tit for tat. I'm pretty sure the 5.5 has a positive rotator in a stock configuration as well. I've sailed on a 5.5 and 6.0 with spinnaker and it works just fine.