We have seen massive improvements in power envelope in CPUs in fairly recent generations, to say nothing of the power improvements seen in some generation->generation GPU improvements.

For example, with an improvement to the 14nm process and not a die shrink, Kaby Lake->Whiskey Lake saw low power processors double in core counts (2C/4T->4C/8T) in essentially the same power/thermal envelope. Basically every thin laptop/ultrabook family doubled its core count.