Products can break, people are born and grow up an eventually need to buy that kind of thing. Some of it can break or wear out even if most of it last decades.

The problem is expecting never ending exponential growth because of the pressures of capitalism instead of finding a stable level of production and making that profitable. Especially with buy it for life products.

IMHO, the bigger issue is that they refused to sell their stuff in stores and on the internet for a long long time. You had to buy from select retailers or a local rep that threw “tupper ware parties.”

A lot of use just moved to other brands that were easier to find, and when we wanted to replace stuff that never got returned by a neighbor, we bought more of the same stuff.

The products also have/had a lifetime guarantee - providing you could find a rep and they still made the product... Got a jug replaced after 40 years of hard service.

It's also why the party model failed them - MLM for a product that never broke or wore out.

Newer tupperware was microwave safe.

Reps got a cut of party sales and if they made enough each month the could get other benefits as well (a company car, for example).

You've just realized why companies love planned obsolescence.