The older cub guys will remember when long winged cubs were all the rage... Everyone was ditching the bows, splicing spars and blowing the tips out. And it worked....
It worked, but everyone who flew enough to appreciate flight characteristics, knew that good ole cub 'feel' was gone... Perhaps you had to have 'Jedi' status to understand the 'feel' thing, but I digress....
Most of the long wing cub STC's add less than WingX, but then again, cubs are lighter... So then the good ones came up with ways to get the aileron back out on the end of the wing... Sullivan (When Wayne Makey was there) made the ailerons 9" or so longer. It is a super easy STC because you keep everything in the stock location. It gets the roll back to stock, or even a tad better... but alas.. with a 9' aileron on the end of a giant wing, it still makes for a 'heavy feel'... Then there was the Charley center one... it was a ton of work, because it took a stock flap, and pushed it out to the tip, then stretched the original flap to give you giant flaps

This makes jumbo flaps, and a false spar (the cove between the control surface and the wing) all the same. The new 'aileron' becomes smaller than stock, but works wayyy better being out there on the tip where it belongs...
FFWD a couple decades or so, and people are coming full circle.... Yeah long wings still work, but with todays engine tricks, and a weight conscientious airplane, a person can run the beautiful stock bows and still get in and out of everywhere their heart desires... they climb like homesick angels, and haul the mail just fine ... In fact today I'd say the vast majority or rebuilds on cubs sees a person removing the extensions and returning it to stock wing configuration... Will 'wagons follow the same course? time will tell
BTW, My cub is long winged, but because a cub fuse is narrower it still fits in a hangar, which is a prerequisite for me... I have rebuilt it a couple times, and always kept the long wings... Modified them a couple times to get a better wing, but for me the long wings work. If the 'wagon had a better executed STC, and would still fit in the hangar there is no doubt I'd stretch them out too
'55, ever fly an eagle? (not the little acro plane, the ag one) with those immense wings they could get an 80+ foot swath !!! and they had roll spoilers... that would be the ticket, but since WingX doesn't add all that much, it seems to me that pushing the flaps out until the ailerons were back out at the tips would work just fine. Too bad in today's FAA no body's likely to pursue such a monumental task...
I'm with you on the pursuit though!
Take care, Rob