My comment on this...The desired usage determines the desired trigger weight. If you are only going to shoot from a bench at paper targets for accuracy, get a light trigger. But then why waste a perfectly good AR to only bench shoot? If you are going to practice defensive shooting use a trigger close to mil spec weight, so as to reduce the chance of AD.
Marines somehow manage to shoot at 500 yards with iron sights with that terrible “heavy” trigger. Anyone who complains about the standard AR trigger doesn’t know how to run a trigger.
In addition to AD concerns, military primers are less sensitive owing to the desire to reduce accidental ignition during rough handling and shipping. Heavier hammer springs are required to insure reliable primer ignition of these denser primers, which means more trigger pull weight.