Geeze. This could be a bit overblown, but I do want to say that I have a pair and haven't had much problems though, but I can see where it could be an issue.
This is not an attack on the designer or anything, but I want to point out that on a mechanics standpoint, the design is not ideal. Most of the stress on a crotch area is shear stress (walking) or lateral (getting in a car). Placing a reinforcement placed how it is increases the amount of stress by about 50 percent. If the patch was circular, the stress would not be there. Also, if the patch remained square shape and was rotated by 45 degrees, the shear stress would be close to 0.
I knew I'd use my engineering degree one day.