Design fault? not sure its a fault, maybe its something that niggles you? ;o))
I've not had any issues with the standard layout of the boat, all the controls work; sure I can pull kicker on a lot easier in a Fireball but that has the same amount of weight in fittings and lines as the Aero hull, to get the same job done for twice the price (or more).
I've sailed many classes and I know i'm biased, but for good reason, RS has always supplied simple to use and easy to maintain boats, so that you can sail them and not spend all your time fiddling with them.
IMHO ;o))