Technical excellence supports tactical preparedness
Lord of the Food Court
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It's nothing new. We have many decades of off-duty and plainclothes LEOs carrying concealed without ever having any training on drawing from concealment. But I think you hit the key with "in the holster on a firing line". Often there can be constraints on a firing line and in a range environment that are not issues off of the firing line. Plenty of ranges don't allow drawing from the holster, drawing from concealment, etc. IIRC, the NRA basic handgun class mandates all courses of fire begin with the gun in the hand. Now, I don't about you, but I just don't want to have a full line of folks with very limited experience drawing from concealment, particularly when Joe is doing the Mexican Carry thing, Sally is using her Concealment Purse, Sam has his gun tucked away in his fancy fake DayRunner, Bill is using his super-duper Magill Tactical Pants holster, Danny is running round with an ankle holster, Larry has his shoulder holster thing going, etc. Sure, you could require everyone to bring a particular holster but then you are right back to the problem...you've checked the box without ever seeing/training the shooter to draw from concealment with the gun/holster combo he is going to use.
"PLAN FOR YOUR TRAINING TO BE A REFLECTION OF REAL LIFE INSTEAD OF HOPING THAT REAL LIFE WILL BE A REFLECTION OF YOUR TRAINING!"