I’ve seen so many ads that show a nice product, so I click and it takes me to nice polished landing page, which leads to a smooth checkout flow. But then the thing arrives and it’s garbage. I believe that there’s an entire genre of niche-marketed consumer goods that have been broken by Campbell/Goodharts law because they’ve integrated the product design and marketing so tightly that the product is designed to optimize CTR and funnel conversions rather than being a good at being the thing that it is.