The point being designers and builders have the challenge to provide upwind foiling for the rest of the fleet in such windy conditions.
Ashby , Tuke & Burling had a custom rudders rake system that permits a differential setup as we've seen and discuss plenty on the AC50 at Bermuda.
Now with the adoption and formalization of the Classic division I don't see a reason to maintain the inner span limitation. I would still maintain insert over the top and no wands (wands are like riding bike with little wheels) but with the adoption of a fully foiling division separated from Classics now the As might achieve more performance if span limits are removed from the rules.