Perhaps someone could build a half dozen "flat plate wings" for little 5 oz wing loading planes - aerobatic models--not gliders .
I would bet money that if all were say 3% thick --one could smooth LE/TE/ make gentle curves / etc.. on and on -- and IF all were subjected to the most proficient fliers -- No one could tell the difference.
From many years back - I always believed in researching first - then trying out the premise.
Without the actual flight test - it all meant little.
My first pattern planes - 30 years ago - followed the accepted designs but as I kept trying different wing setups -I found more and more of the rules simply did not apply to these planes.
Progressive airfoils , special tips , etc., all were put forward as "better " for acrobatic setups but the only real improvements I could ever find was simply from reducing wing loading and increasing power loadings.
What is funny , is that this is the same as found in full scale aerobatics.
I can't think of any real exceptions --
just rambling--