Staying with a discussion about 1 design, I'm in Carl's boat on this one.
A person could argue that increasing the allowable 1 design inventory to include a 1/2 oz spinnaker would improve the boat performance in light air. However it also would increase the cost of participation - both points made above
My position is that if all boats sail with a 3/4 oz sail they all sail with the same performance advantage/disadvantage but at no increase in cost.
To me, keeping the cost down is more important than adding to the inventory.
Also my opinion, any discussion about changing the one design rule should not be about how this rule change would help only one PHRF area