Just wished I had better control on AMD GPU being used whenever I plug in a display for my MBP16, just ramps up the fan for no reason while my Air is just sipping away on the same display with iGPU..
In 2016 when they were redesigned I don't believe the intel IGPU could drive 4k @ 60hz, and Apple also wanted compatibility with the LG 5K display they partnered with. The best solution was to just force all external displays to be routed thru the AMD GPU.