The first nylon stockings were indestructible and could last a lifetime. Then, as we see with electronic goods today, companies got wise and began to build in obsolescence and weaken the fibers with chemicals, so now nylons run and have to be replaced, sometimes almost as soon as we put them on.
A simple search will show that the same thing happened to light bulbs. The first light bulbs were made to last thousands of hours. more, Livermore CA celebrates a bulb that’s been burning straight for 109 years.