It seems like an implicit premise in that line of reasoning is that consumers have a choice: they can increase their spending if they want a quality upgrade, or they can forgo the upgrade and keep their spending relatively constant.
In some cases, though, there often isn't much of a choice. I can't buy a (new-ish) car without a rear-view camera, now that they're mandated. I can't hire a builder and tell him that I don't need GFCI outlets, or HVAC, or fire sprinklers; it's all required by code. If I wanted a ~1000 square foot house, I could have built one 50 years ago, but today my planning department wouldn't approve.
Similarly, I might have been content with the experience of using my iPhone 4 back in 2010, but I can't recreate that for much cheaper today. Even if I could buy an iPhone 4 for cheap, it no longer receives security updates, and many apps have dropped support, or at least focus their QA on newer devices.
Or I might have been content with the 2mbps connection my ISP offered back in 2000, but now their plans start at 50mbps. Even if I could find a cheap 2mbps plan, it wouldn't be as practical given the bloated state of websites today. (I mean it's doable, buy my quality of experience would be much lower than it was in 2000.)