It’s not only me. It has been proven several times how danger can be draw stroke when your index finger stays depressed and slips over trigger.
If inexperienced shooter does this… usually it ends up with negligent discharge.
The best example of the problem is known as “I just f… shot myself” video:
Watch very closely the moment when gun went off and listen his explanation…
Of course, it’s not a holster issue, but chances of having the same incident from the student are very high.
I was just rejected from a range because my Urban Carry holster does not fully cover the trigger guard. It does cover the trigger, but shockingly, a finger can sneak in and push the bang button.
Conclusion: Something big and clunky (kydex) for the range, and Urban Carry for concealment and comfort.