If you look closely in the middle of the picture, you can see the debris field from the balsa fuse coming apart after being hit from the side by me (the plane leaving on the right, no damage noted on my plane).

There's no way you can make a wing not flex when hit from SOME direction. Not all mid-airs are head on wing LE-to-LE. In fact, I'd say that's one of the least common ways for me to hit someone. It's often nose-to-wing top/bottom surface (T-bone from above/below), or wing-LE-to-fuse or something simular.

Oh, and the #1 cause of damage: a 9x4 prop turning at around 20k. Those props will cut though anything, including CF. And when the slash is combined with a solid impact, the CF will shatter. On the other hand, I've landed after a full round and found through-and-through prop cuts on the wings that I didn't eve know where there. I've had t-bone shots that left a 2" diameter dent in the bottom surface of the wing, and a couple of cuts all the way though the wing, and the wing stayed intact and allowed me to fly on.

It's also very common to have prop cuts to the tail surfaces. I've landed with cuts on the vertical stab that basically split it in two with no noticeable problem. Slapped a little tape on it, and flew it the next round. (I have one stab still in service that's been prop cut 3 different times, a total of 5 cuts if I recall).