Well, and of course I say this as a new yorker ..heh , you're right in the initial post when you say the new york reload really applies to revolvers as for most people they are far slower to reload. Personally I don't see much point in having two pocket autos, when a magazine reload would be available for a primary defensive gun.
I see it like this..
I carry a .45 caliber 1911 OWB with 8+1 condition one. I also carry a reload in a quality magazine holster which keeps it always ready pointing exactly in the direction I expect it to be if I need to reach for it. If for some reason I had to do it, and I hope I don't, it makes sense that it would likely be significantly faster for me to fire 8 rounds, draw and slap the new mag in and continue firing if needed .. than it would to be fumbling in a pocket for a second gun. So, trading off speed, accuracy and 17 rounds of .45acp for 14 rounds of .380 .. nope, not for me.