I've been carrying AIWB for over 30 years. Usually very safely. I guess my carry method is a large part of the reason I prefer my carry guns to have long trigger pulls and or safeties.
Glock like triggers without external safeties do require extra care. Holstering AIWB should not be a multi-tasking item. Stop what you're doing and give it full attention.
As mentioned by another poster, I think it's often prudent to remove the holster from the pants, holster the gun and then return the holster to it's carry position. Granted, that's a PITA but it's a sacrifice you need to make. For me it depends on the gun and holster. I'm particularly cautious with lighter short stroke triggers, especially with floppier, less stiff holsters.
That's one reason I don't get the guys that want the Shield V2 over the V1. Give me the V1 trigger with an external safety. I can engage the safety, holster, check everything and then release the safety.
Sometimes I carry an officers model 1911 AIWB. I do have a stiffer holster with hammer shield. So, good thicker non-floppy holster with hammer shield and a gun with both a grip safety and thumb safety. I'm good to go. You do give up some comfort and concealability with the thicker, stiffer holster. But not much.
I also carry a snubbie revolver AIWB. Use a decent holster, no multi-tasking while holstering, holster before stowing if appropriate, thumb on hammer while holstering. Again, no multi-tasking are jaw jacking while holstering. Pay attention!
I do recall a story told my by one of my former co-workers (I considered a mentor) recently deceased, a former SLPD officer. He related that during one of his more wild west undercover days, in which he was carrying his service revolver AIWB (no holster), looking down after some recent police related activity and discovering the hammer back on his gun. That one scared him. It would me too.
I'm willing to bet that in this age of proliferation of CCW and frequent AIWB carry, the majority of the carrying public don't give holstering the care and undivided attention it deserves or really that any holstering deserves.