Battle field pickups not withstanding, the cross platform issue a valid arguement, but not one I would press.
I try to add stress when I shoot, even if it is only against a timer.or against another shooter, or monetary pressure. I have never shot anyone, but I have pointed guns at A LOT of people, under stressful conditions where pressing the trigger, frankly, would have been easier than checking my fire for whatever reason I needed to.
I teach the power stroke, and the slide release to the people I teach. I no longer buy the gross motor skills vs fine motor skills argument (thank you Hilton and TLG). And I have, over the last 25 years interchangibly carried 5 and 6 shot revolvers, striker fired pistols of both the partially tensioned and fully tensioned types, TDA, DAO, and single action conditions one, three, and four. Ten minutes of dry fire and I am acclimated to my platform of the day. I have never had to do more than acclimate to the handgun of the day. I also have no problem going from strong side hip, AIWB, 4 o'clock OWB/IWB, SOB, crossdraw and shoulder holster. Traditional tactical think would say that I am AFU. I also put partially depleted magazines back in mag pouches rather a pocket after a tac load. Not only am I gonna get kilt on da streetz, I am likely going to Hell for such blasphemy.
Can I honestly say that I can't screw up? Nope. Do I think my way is ideal for everyone? Nope. Do I think I am a special unicorn of the gun world? Nope.
What I do think is that as adaptive animals we sell ourselves short. I am absolutely willing to risk my life, the lives of those I love, and the lives of those I am charged to protect, on being able draw, fire, and manipulate various guns I am familiar with from any position I may be carrying.
All that said, south paws need to make things work for themselves. There is a saying among firearms instructors about the wrong handed....
pat