A decade ago, there were more MP3 player choices with low cost and good quality, even supporting open-source firmware. Now there is low cost/quality and high cost/quality. This thread has more details, https://news.ycombinator.com/item?id=26870648

There was a time when laptops had 4:3 screens. Then the market changed because of demand for HD-video screen ratios. Today, the only portable option for 13" 4:3 screens (vertical real estate for text editing) is iPad Pro.

Hyperscaler cloud vendors can now order custom CPUs that are simply unavailable to retail. There's an endless list of markets which have been altered as demand volume shifts from one segment to another.