I get that but I don't see it happening with stock j-arms. The stocker should bend before the frame. With that said, apparently an aftermarket j/d-arm will tweak the frame so I guess what needs to be decided is what the frame is going to be used for. Open duning, hill shooting or drag racing go with either one. For mx, trail or any other riding where there's a higher probability of wrecking or hitting something, an a-arm frame is recommended.