I also have a 16" MBP from work, well spec'd. When using my external monitor, it won't switch to the intel graphics. It's always using the AMD GPU which causes additional power draw + heat. I wish there was some way to force the iGPU to be used when an external monitor was plugged in.

Also, turbo boost switcher has dramatically improved thermals. Turning off turbo shaves like 10C off low usage temp without much of an impact on usability.