As a point of order, I still don't have anyone providing links to this retreat to 9mm as a wide-spread LEO phenomenon.
Now, civilians, I would go there. Mainly because people say (as others have on this thread) "modern bullet technology makes 9mm a far more viable and lethal choice then it has been in the past".
What the new female shooter, the cop just trying to get by, the prepper who is not into guns and wants to be a minimalist about firearms hears is....."9mm is just as good"...... and then they go out and buy a bunch of cheap 115gr FMJ, the very round that gave 9mm the lackluster reputation it had in first place.
Don't get me wrong; I have a few 9mm pistols, but I am far more fussy about what I stuff in them than just about anything I shoot. But the core constituency of the resurgent 9mm is about inexperience and cheap ammo.
If that shoe doesn't fit, then don't wear it. But that's just my opinion, based on what I have seen, heard, and read in the last couple of years.