Glocks come with two triggers, one a light trigger and one called the NewYork trigger that pulls at about 9 lbs. They set up the NY trigger to be 9lbs because that is the safety standard of police carry for a double action revolver. At 9lbs Double action I feel comepletely safe with my finger on the trigger of any revolver because my brain works. Glocks have different triggers and no manual safety.
A 9lb trigger or a 99lb trigger, seems to me you should be comfortable with your finger on the trigger only when you are pointed at a target and are ready to shoot.