There is nothing wrong with respectfully looking at an incident like this and considering what went wrong and what went right. That is the benefit of learning from others mistakes and successes. Any discussion done respectfully and considering the context and what the people involved knew at the time is healthy. Police and citizens do some crazy things in critical incidents and no one gets hurt or killed. Looking at the good and bad of each helps everyone learn what to do and not to do or do differently for less risk.
Having a full magazine and quick access to the firearm is another benefit learned from the incident. More will come out. I am curious as to what body armor the BG was wearing. Hard plate carrier,mil surplus stuff, or LEO soft type body armor and what level. That makes a difference since the Goodguy was using a .223/5.56 likely.