The difference that I have read is that the "concealed means concealed" is against policys when that crowd is doing it., not Laws.
I havent been around long, just my opinion from reading this site for hours on end.
There are plenty of folks willing to carry in places where it's illegal and deal with the consequences if the need to defend oneself arises. They just don't want to get caught before that time comes.
I won't begrudge anyone for this very personal decision, I just choose to play it safe and obey the laws on the books while doing what I can to change the ones I don't like. It's all about risk management. Avoid trouble where you can and be ready if you can't.