That's always a tough message to get to sink in, unless folks have experienced incidents where they have been attacked. Situational awareness is critical to self defense. Ideally you avoid a conflict altogether by SA. If that's not possible, SA is the critical to having the time to prepare for the conflict. Whether the fraction of second in chambering a round will make a difference in your outcome is dependent on many variables that are unique to the person making that decision to carry in that manner. Only you can make that decision of what is best for you - based on your environment, your equipment, your training & skills, your own risk assessment, etc. That's why this discussion will continue on & on. There is no 'one right answer' that applies to everyone.