There was a time when open carry wasn't a political issue because everyone understood what the Founding Fathers meant when they wrote it. And, as I've written before, no one showed the slightest concern when I, a teenager, rode a bus or my bike carrying a large caliber rifle(s).
That was before 1968, when Charles White shot up the University of Texas campus shooting a high powered rifle from a tower. (I was in grad school in Abilene, TX, at the time.) Since then the meaning of the 2nd Amendment has been and continually is under political revisionism. That which "shall not be infringed" has been, and now we are discussing if one law which infringes the 2nd Amendment can abrogate the plain meaning of the 2A. To my old eyes and mind it is both amazing and disgusting.
But, considering the political realities, and how many bitterly cling to their nanny state for safety and permission to do what they used to have an "unalienable right" to do, IMO it would be wiser to never carry open. First, it would alarm the fearful thumb suckers. Second, it would make the person a target of political agenda groups. Third, it would mark someone as a potential target for future assault specifically to steal the weapon. Carrying open doesn't give someone eyes in the back of their head, and if unseen a pipe or piece of 2X4 to the back of the head means they are out of action and no longer in possession of their weapon. CCW gives the necessary secrecy and surprise. OC totally destroys that. Which, BTW, is why I am for the law which prohibits posting the names of CHP holders in the news papers or websites, and why others, on the Left, against it.