Yes they have. Take washing machine drum bearings. you used to be able to remove the drum and install a new bearing without any problems. The bearing was usu

Yes they have. Take washing machine drum bearings. you used to be able to remove the drum and install a new bearing without any problems. The bearing was usually in an external housing so rarely deteriorated. In modern machines the drum bearing is inside the drum leaving it to the mercy of living in continual water and detergents. The one very small pathetic rubber seal hardens over a short period of time. The bearing dries out, no more grease, rust develops, leaving an extremely loud washing machine that sounds like a 747 taking off. you cannot replace the bearing.