Thats what I always have thought as well and mainly why I haven’t installed a 180 degree thermostat. Just for the sake of discussion though, others have made the point that cooler temps would be better for the engine, fluids, internal and external parts, performance, etc. They said the only reason manufacturers run the engine at the temp they do is to meet EPA standards.
Ive always been an advocate of leaving it alone as well but these are good points. Im hoping someone can shed some light here.