At least here in Germany Aldi isn't even really limited to the poor, it's famously a place where you can run into anyone. Where I used to live in Berlin close to the government district I literally on occasion ran into the chancellor (and her bodyguards). Aspirational shopping where you buy premium goods to pretend to have higher social status honestly seems a bit on its way out. Even middle class people seem to consciously shop more utilitarian now.
https://en.wikipedia.org/wiki/List_of_defunct_airlines_of_th...
https://en.wikipedia.org/wiki/List_of_defunct_airlines_of_th...
https://en.wikipedia.org/wiki/List_of_defunct_airlines_of_th...
Seems more like a overall industry problem, not limited to low cost carriers
Spirit was broken by oil prices which everyone pays the same for. (There is no cheaper jet fuel alternative).
Not a good comparison to the point of wrong conclusions.
Spirit was broken by oil prices because they target the low end customer with their ticket prices. Oil prices went up and they had no pricing headroom to charge more on tickets so they simply went kaput. Ryanair also suffered a fair bit. Other airlines did (comparatively) fine because they had the ability to increase prices since their customers are less price sensitive.
It’s a classical business lesson that being a “cost-sensitive” vs a “value-sensitive” business (what this tradeoff is called) is a tradeoff. It’s notably recommended that startups don’t target the lower end in prices since you can’t compete on cost with a business that has more economy of scale than you; you have to compete on features. And being a cost-sensitive business means that you are affected much more than other businesses by changes in material/component prices, because a 13-cent increase in the cost of a component matters more the more product you sell, and if you increase prices too much customers will start to wonder if the “budget” brand is really a good value proposition over the mid-end or high-end ones anymore.
Literally everything you're saying doesn't line up with reality. Apple's most popular product today are two lower end (neo and mini).
You make the mistake of thinking your theory defines reality, when in fact reality says quite the opposite here.
I'm saying this because your logic is the classic logic that everyting thinks makes sense until you do it. Everyone can't target the high end, there are limited customers with many choices, making it far harder actually to win.
You target the demand/pain/need regardless of market.