Massive corporate consolidation means that when you're looking at the rack of chocolate bars there's a good chance that just 2 companies made all of them. You have the illusion of choice.
None of this happened over-night. It's a slow steady financial optimization in all industries all at the same time. It's very hard to vote with your wallet when there's very little difference.
Consolidation alone is insufficient to explain such a gap under the assumption of profitability.
It's almost impossible for a new company to join most of these markets; the major players are so large that they have influence over the retailers, the suppliers, and everyone in the middle.
But every so often successful higher volume/quality/durability products do manage exist for a time but are eventually bought out and the brand destroyed. This has played out over and over.
The market optimizes for profit growth, not for customer satisfaction.
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.
It turns out that it's more profitable to buy up an existing brand and slowly cheap out on the product (basically capitalizing the reputation) than it is to continue to produce a quality product.
I don't think you can really say they want it, because in many instances they are manipulated or have no other choice.
The electronic spreadsheet.
In a sense, it is the people's fault for their current level of tolerance, but at the same time, a data-driven society will converge on an equilibrium just within the razor-thin margin of what people will tolerate, in the name of 'efficiency'.
Needing a app to turn on a light, though, that's just weird.
The phrase you're looking for is "value engineering."
There are also other factors.
Part of the reason that Pringles cans are mostly air is so that the soap company that makes them can sell fewer chips, but retain the same amount of visual space on the store shelf. The product is the billboard. Some brands pay for that space on the shelf, so they're going to use every bit of it.
Different products in different stores, I guess.
Here, and in every other American city I've lived in for the last 20 years, the tall can of Pringles is 50% air.
Do a quick web search, and you'll see hundreds of people complaining about it.
I once complained to the soap company, and got the expected response: They're sold by weight, not volume.
Your posting history indicates that you're not in the United States, so perhaps store shelf space isn't as valuable where you live.