Snowbird, it's not that I have "chosen to promote" anything. I simply gather as much input as I can from people and departments who are using the given product in actual gunfights, to determine how it works.
Glock is correct that they built their .40s around the original .40 S&W load, the subsonic 180 grain. That said, I am aware of NO department which has had reliability problems with the 165 grain or 155 grain full power .40 loads.
Some departments are satisfied with the performance of the 180 grain subsonic .40. Some are not. Among the latter, some have gone to 165 grain at 1140 foot seconds and seen an improvement in the effects of their ammunition on the street. (Tulsa PD comes to mind.) Some have had the 165 grain full speed .40 for many years and found it to be a superb "stopper"; Nashville Metro comes to mind. Some departments have been dissatisfied with the effects of 180 grain subsonic .40 and switched calibers, such as the state police of Pennsylvania and Georgia, both of which went to .45 GAP and, from all indications, still feel they made the right choice in doing so.