It does? Try googling broken handlebar stories. Cracks in aluminum are a sign of imminent failure. Sometimes we don't notice the cracks and then when the part fails, we say it failed "suddenly."

Still, I wouldn't worry too much about that "dent" to the seat stay because I can't see it and even if one seat stay completely goes, you still have another seat stay, top tube, and downtube supporting the seat tube.

A handlebar - once that goes - not much is left!