For good airfoils and moderatley skilled pilots I would agree that a constant chord wing would not need any washout. But for novice builders and pilots that may not shape the leading edge quite correctly enough or try odd control mixes at the sticks at low altitudes I can't help but think it's a good idea.... or at least a SAFE idea. Add to that the lovely Florshiem 10% airfoils that often look like they came straight off the insole of the designer's shoe and there may be more reason for it. An otherwise nasty stalling charactaristic may be softened by some washout so the wing doesn't just let go all at once.

At least that's my story and I'm sticking to it..... Especially after flying a semi scale ARF Piper J3 that did about 3 stalls that flipped into true spins that needed careful and lucky control inputs to recover from. This model had exactly 2 flights on it before being retired. I had the misfortune to be the pilot on both occasions. The first one I barely got it back on the ground in one piece after one spin and the landing was done at Mach 0.8 to ensure the wing wouldn't stall and spin again. Even then it DID try while I was flaring at about 1 foot of height and still moving quite fast. The second flight a couple of weeks later with the CG moved slightly forward and some washin added proved that it was slightly better but still nasty enough that it spun once from high altitude which I corrected and the second one got me on a shallow turn at about 100 feet. No time or room to do the push down, opposite rudder and then up slowly that it needed for the previous recovery. It was buried as the piece of junk that it was.

So don't tell me that constant chord wings don't tip stall.