Higher temps are for emissions. You get a cleaner burn at higher temps. That is why I believe the ECU is program to run at higher temps for cleaner emissions. If the temps run colder then the ECU may not reach its Optimum settings for proper emmisions. It may not make a difference to the daily driver but that is why the higher running temps. Too bad the failure rate of these parts is high from higher temps.Cooler then stock is all you need.
That colder 40* or whatever works wonders on parts lasting longer.
That stock temp for the gen1 is why you all have the problems you all have. I don't know what GM was thinking when they did that. It certainly didn't do wonders for their profits.