I would rather shore up all loose ends and minimize/eliminate points of failure than agree upon an "acceptible" margin of error. This is analogous to an "acceptable casualty rate" in combat/training/daily driving. "Anticipated" and "probable" are not synonymous with "planned."

Perhaps it would be wise to deploy polyurethane bushings, in addition to stronger brackets/mounting hardware.

I wonder if anyone makes front shock bushings in polyurethane (as used in skateboard truck grommets) - instead of OEM (Turkish?/German?) rubber.

I have to wonder to myself if some/most of these kinds/types of problems are, in fact, carefully planned variables of obsolescence - enabling Mercedes-Benz (and ALL automobile manufacturers, for that matter) to exact years of iterative, scheduled service from its customers - or if technology truly has yet to be perfected to the degreee that parts can be manufactured which will survive the test of time...