To me if you exclude the high-end ARM CPU these are high-end devices.
1. High Resolution Touch Screen
2. Ultra Thin Laptop / 2-n-1
3. 20+ Hour Battery Life
4. Cellphone Modem
5. Corning Gorilla Glass
If you want an example of poor quality look at the latest HP Envy.
https://techreport.com/news/32920/report-hp-envy-x360-battery-life-drags-regardless-of-cpu-vendor
1. Poor Battery Life
2. Immature firmware and drivers
3. Different Hardware (Display, fit and finish) between AMD and Intel offerings making it impossible to compare.
4. Sub-Par color gamut coverage
5. The list goes on...