many many of us have had no issue with canyon dancers. but you'll always have one in the crowd that tightens them or finds some way to have a problem. I've seen sport bikes with the clipons bent and it was blamed on the canyon dancers!
there is no need to go crazy tightening them to stress anything. And the side to side motion of a vehicle, you could turn sharp enough to roll it and you shouldn't break the cast bars on the bike.