Yet the old MBP was not able to even draw sufficient power to run the CPU and GPU at full power.
Apple
chose to put in an insufficient power supply on their pro laptop, even though an increase of 5-10 watts would have been sufficient. No one expects [or should] a 1080m in a 15 inch laptop. But we are getting a GPU which is comparable to a 965m, when thin 14 inch laptops like Aorus X3, AERO 14, GS40, and a few others were using a 970m last year. Now they use the 1060 which gives 2x-3x more performance than that, which is already faster than the 965m/460.
But even that misses the point. If Apple could put a magical 1060 in and still make it thin and cool, but need 5-10 more watts, they would not choose to do so. They choose to "depower" the hardware in favour of thinness.