Patrick,
You hit the nail on the head, the difference between IWCA OD and IHCA OD (keep SMOD out of it for now), is the issue of tailoring sails to the sailor. IHCA sees this as having the potential to create an arms race, driving up the costs (this happens in other classes all the time). IWCA sees it differently.
I'm not taking sides here, just pointing out the philosophical difference.
The real question is, how do we resolve this to move forward?
Mike