I wonder how many of your colleagues would disagree with you. Being a professional firearms instructor, perhaps you have read studies that measure how many shots are typically fired in confrontations involving handguns.
While I would never base my information solely on what my colleagues think I can say without question that every single one that I believe is worth a darn would advocate carrying as much gun as you can.
Anyone who knows me or has attended my courses understands completely that I advocate skill and mindset as being superior to the choice of weapon. That however does not mean that I believe it correct to place little emphasis on weapon selection.
True enough, a snubbie or similiar weapon will get you through a very large percentage of situations. I am familiar with the studies and percentages. However, not a single one of those percentages or studies takes into account the gunfight I may be in tonight while I'm out shopping at the mall.
For every percentage and study, I can point to a situation that can, and has, occurred that is not in keeping with the odds. I do not prepare, not do I train my students to prepare, simply for what is most likely. I have and will continue to advocate carrying the most weapon that you can because it will address the greatest number of scenarios, not just the greatest percentage. If, for whatever reason you can only carry or handle a lightweight or niche firearm, I hold no fault against you for doing so. That would indeed fit my reccommendation for carrying the most firearm that you can.
Since you asked, and this is not for the sake of argument but only because you brought it up, here is what some of my colleagues, whom I respect, advocate, along with a quote or two from them:
Clint Smith, Thunder Ranch - Full size 1911 style .45
A reporter did a human-interest piece on the Texas Rangers. The reporter recognized the Colt Model 1911 the Ranger was carrying and asked him 'Why do you carry a 45?' The Ranger responded, 'Because they don't make a 46.'
You can say 'stop' or 'alto' or use any other word you think will work but I've found that a large bore muzzle pointed at someone's head is pretty much the universal language.
Freddie Blish, Gunsite instructor (and former Gunsite CO) - Seen him carry a Glock 21 or 1911
Larry Vickers, Vickers Tactical - Glock or 1911
I am a big fan of both the G17 and G19 in 9mm and that is what I use.
Massad Ayoob, Lethal Force Institute, carries various full size handguns
Rule #9 of Concealed Carry - Carry An Adequate FirearmIf you carry a single-shot, .22 Short caliber derringer, you will be considered armed with a deadly weapon in the eyes of the law. You will not, however, be adequately prepared to stop a predictable attack by multiple armed assailants. Most experts recommend a five-shot revolver as the absolute minimum in firepower, and the .380/9mm/.38SPL range as the minimum potency level in terms of handgun caliber.
It is a good idea to carry spare ammunition. Many people in their first gunfight have quickly found themselves soon clicking an empty gun. A firearm without spare ammunition is a temporary gun. Moreover, many malfunctions in semiautomatic pistols require a fresh (spare) magazine to rectify.
Chuck Taylor, American Small Arms Academy, full size 1911
My rule of thumb is to use the most potent handgun I can handle well under stress, whatever caliber it might be. I think you would also benefit from this approach.
Again, while these are quotes of instructors whom I respect, I do not just cut and paste their advice. Their views simply tend to support mine. Understanding that the world can be a cruel and dangerous place, and understanding that I don't get to choose the circumstances surrounding my next gunfight, I also understand that my gunfight may not fit neatly into the statistic of 2-3 shots fired.
I will therefore carry, and continue to reccommend carrying, a full-size firearm and spare ammunition. While I don't see any fallacy in that, I probably won't be there to assist you in your gunfight so if a limited duty firearm is your choice, I won't disparage you for that.
I truly do hope that you are right in believing you will only need a limited duty firearm. What's more, I hope you don't even need that.