I still don't see how expanding the inventory but limiting purchases would create an arms race. Having more than one primary headsail and chute means that each sail is used less, lengthening life span. At the same time, boats racing PHRF most of the time would then have inventories comparable to the competition.
J-30's are known to have ratings that disadvantage us in light air, and anything the class rules do to improve light air performance helps those of us racing in PHRF (and we do need help in light air). It also would make class light air racing (I hear there is occassionally light air down in Annapolis) a little more fun!