> What frustrates me is that no one else in the industry gives the slightest fuck about pixel density, even when Apple has demonstrated for years that people really value sharpness.

It's not that they don't, it's that they can't. There's no way to make a high ppi laptop that's small and light and doesn't kill the battery in 3 hours of use.

GPUs that drive that many pixels are power hungry. Apple designs their own integrated GPUs now.