I think a point has been missed here... As with any material, if you go beyond its elasticity limits, it will eventually break... Just like with a spring, if you stretch it to far enough times, it will eventually break...

I feel the use of CA hinges is fine as long as the control surface movement is not to great... Those that are into 3D type control surface movements (over 30 degrees), then a robart (or other hinge type) might be the best choice... For most flyer's (control surface movements of 15 degrees or less) the CA hinge will perform and last just fine... I use both types of hinges and as yet have never (in 18 years) experienced a hinge failure of any kind... I believe hinge failure is a result of poor installation technique and/or use of poor quality hinges... Buy and use what ever suits your needs...