The case for open carry isn't just YES or NO.
If you open carry, you deter most criminals. They'll stay away from you.
The ones that aren't deterred are the most dangerous among them. With those individuals, you've not only given away a tactical advantage, you've called attention to yourself and attracted them to you.
Some OC just to emphasize their right to carry and are looking for attention. There might be maturity issues with such individuals.
Others OC because that's the only way they can under the law. Some OC in certain situations, like rural envronments, while camping, etc.
In some professions you might as well open carry. Jewelry store owners, gun shop owners, etc. can usually be assumed to have weapons close, if not on them, and there isn't much tactical advantage lost if one open carries.