Are you saying 'unwise' due to being the target of a gun grabber(part of carrying a gun is maintaining control of the gun), gathering disdaining responses from other people(personally, I don't give a damn what someone else thinks) or being targeted by LEO who wish to discourage ANYONE from being armed (keep the recorder function of your phone handy and tell the fuzz you're recording their actions)?
IMHO, open carry may be 'unwise' in some locations. One big difference is how many folks engage in OC. The more, the better. If one person open carries, it results in unwanted attention. If one THOUSAND open carry, it's totally different.
MO has always been OC in most places and is now 'Constitutional concealed carry'. Neither of these has caused the highly touted 'gunfights in the streets'.
I often OC especially in summer. One would surprised just how few people pay enough attention to notice a discretely holstered handgun. I do notice and the number of citizens(both male and female) with a holster on their belt would surprise some folks.