In what wasy was stress put on the system? On our truck, the SlushBusters put no stress on the system. What little stress that is exerted when the wiper blade passes over the SlushBuster is absorbed by the give that happens in the rubber wiper blade when it passes over.
See the photo below. Look close and note how the rubber part gives at the point of contact while the rest of the wiper system is unaffected. Also note how tiny the point of contact is.
If the SlushBusters are installed incorrectly such that the entire length of the blade strikes the entire length of the SlushBuster at the same time, a slapping action will result and vibration may be transmitted through the wiper system, enough to produce accelerated wear, but even that would be unlikely, I would think.
SlushBusters need to be installed at a slight angle to the wiper blade so only a tiny part of the blade makes contact as it passes over the SlushBuster.