A 4 cylinder engine vibrates. It just does. Simple physics explains it, and there’s really no way to iron out the shaking. As long as people want a car with the smooth operation of a refrigerator, and high fuel efficiency is a valued asset, there will be sophisticated motor mounts. And they wear out, like everything else.
I think the sound of the parts’ name scares people. “Oh my God, the engine’s falling out of the car!” But the replacement isn’t that enormous an expense, and does not signal the death of a car.