Here is my perspective:
I don't generally carry a primary weapon without a holster. The average gun toter never gives it 2 thoughts, but most fights are physical long before bullets go to flyin'
I have had more than a few occasions to end up physically fighting with someone, while armed with a service weapon.
The punchline is that when you are rolling, physically fighting someone, stuff goes flying.
As a weapon retention instructor, I can tell you that this is actually old news.
When you get punched in the face/knocked down, if you have (had) a gun simply tucked in a waist band, odds are more likely than not, it will not still be there.
It is bad enough rolling, bare knuckling it out, but the last thing I want to do is to have to have a brutal ground fight AND be struggling for a loose gun.
