For me, it's all about the "local custom," as well as the "legality." If folks OC in a given locale as a matter of custom, then that locale is used to it, LE is used to it, all is well. I might OC there. But I'm more than likely to CC. Why expose my firepower and make myself a target?
Where I live in NJ, OC of hand guns of any sort is expressly verboten except for on-duty LEOs! CC is only allowed with a NJ CCW permit, which is almost never given out (even retired LEOs have difficulty). Oddly enough, is is legal to OC long guns (i.e. "field hunting, etc."), but good luck to you if you try hunting inner city rats in Newark!
I think if the pro-2A gods were to wave a magic wand and make all forms of carry legal in NJ tomorrow, I would still not want to OC in NJ, simply because the public, in general, and much of local LE in particular, isn't culturally "ready" for it. I can see walking into that Panera OCing and having them SWAT me!

I can see many elements of LE in the state that would freak and draw upon seeing someone OCing, even if it were legal. simply because their mindset only allows for LEOs to be armed... Maybe not so much out where I live, but more in the inner cities.
In fact, just yesterday, for the first time, I exercised my FL CWFL a bit and CC'ed in one of my favorite restaurants in the middle of the Sunday Brunch crowd (in Fl, of course

). No issues whatsoever. The more comfortable I and others get, the better.
A funny story... earlier in the week, I was in a local grocery store (not carrying at all), having just finished up at a local outdoor range. When I went to the checkout counter to pay for my items, I reached in my pocket for change and out with the change came a few stray AE 115 9mm FMJ live rounds...

Thankfully, I kept my Poker face on and fumbled the contents in my hand a bit more, while I put it all back into my pocket. It doesn't seem like the clerk was looking to closely at my hand, (PHEW!).

I just whipped out a $20.00. I got my change, and my groceries, and left. No issues, but I still wonder if she saw what was in my hand... I was freaking a little on the inside.... It's funny now, but a little unsettling then. Point being, if I'm still that queasy about such incidents, imagine the public when encountering those OCing, if not from a community where it's "custom practice."