A lot of the durable goods that became very cheap were a huge quality of life improvement that we simply take for granted. In 1970, which was when boomers were about the same age as Gen Z is today, only a third of americans had air conditioning. Today it’s almost 90%—basically only the people in very temperate climates don’t have it.
A company named Simplicity prospered by selling patterns: the woman would tell the company what style and size she wanted, then the company would send her a package consisting of instructions and pieces of paper in the precise shapes needed to make the garment. The woman would attach one of the pieces of paper to fabric with pins, then use lines and symbols printed on the paper to know where to cut, then attach the next piece of paper, etc.
Durable goods became much less durable, too. Furniture is the biggest one I'd say - they're just not built to last anymore. Whether it's planned obsolescence or just extreme cost cutting, we aren't comparing apples to apples here.
Like the previous poster mentioned, I'm not sure that's really such a quality of life improvement.
First of all, food. I don't know where you shop, but the cost has definitely doubled, even tripled.
Second of all, the idea that it's some "good" that these things are "cheap" relative to wages - before they may have been expensive, but they were also investments. It doesn't really matter that much, because you can save to obtain them, and don't need to worry about re-obtaining them. Being in a situation where durable goods are cheap, but cost of living is high, means that you are disproportionately struggling - you can't save anything, any good that these products provide is outweighed by it being too expensive to live...