One factor not mentioned in the article... most LEO handguns have large frames/full-sized meant to be openly carried and usually aren't the best choice for concealed carry (even more so for smaller persons and/or seasonal clothing).
It's all about the person, their holsters, and the way they
dress. Agreed there are some guns that don't carry well IWB, but there
are still a buttload of "duty" sized weapons that can be carried with the right
holster and belt, etc. More formalized clothing choices end up limiting
options quite a bit, though. Everyone's situation is different, though.
IMO I think the reason why most people downsize/down weight carry guns
is just to reduce the "pain in the ass" factor more than anything else. For
instance, my P229 conceals almost as well as my USP Compact, but the
USPc is "better" (for me) because it weighs less.. sounds dumb but after
lugging the gun around all day you notice that missing like 6 oz of weight real
fast. A buddy of mine basically gets irritated at carrying anything else
for long periods, so he ends up gravitating to a 642 hammerless. I was
doing that for awhile, but since I couldnt hit the broad side of a barn with
mine it was barely better than not having a gun at all. My marksmanship
was so poor with the 642 the only way I would have been successful in an
emergency was to jam the revo under the chin of the BG and pull the trigger...
and that's not very convenient or safe.
-Mike