It’s also a consequence of constraints. There has not been a pressure to make desktops more energy efficient, since they’re attached to a permanent source of in

It’s also a consequence of constraints. There has not been a pressure to make desktops more energy efficient, since they’re attached to a permanent source of incredibly cheap power. Even laptops spend a large portion of their time wired in. Phones on the other hand are rarely plugged in, and consumers clearly demand more battery life. This has led to resources being poured into cell phone battery capacity and into efficiencies in power usage.