There is a spectrum of how good a product is between "doesn't work at all" to "falls apart in a couple uses" to "lasts five generations of your families lives."

Companies tiptoe this fine line between having something so shitty that people immediately reject it and so good that they never buy any more and the company folds. It has to be just shitty enough where they can guarantee future replacement sales but not so shitty to put people off right away.

Most of these durable goods products are therefore found in companies too small to satiate the demand of their entire market share too fast. And even then they fail all the time.