Right -except - why do you always exclude WAG airfoils as simply a piece of uninformed , puttering- when the WAG may actually be as good as it gets?
a very good friend of mine once worked as a wind tunnel model maker (Convair) and he told me that a fair amount of the "carefully designed /calculated etc., foils were simply --WAGS. based on past experience
The bosses liked the term "engineered" better than "a wild assed guess."