A few years ago, I watched a update of a PBS Frontline doc about the police academy class of the Philadelphia PA police department(2001).
In a clip of the cadets from 2001, a young female couldn't re-holster her duty Glock pistol in a Safariland retention holster.
The PBS special noted how the Philadelphia PD had a 97% graduate rate compared to 75-80% for most state police training academies.
To train & prepare with the proper gear is important. Some understand that point more than others.