If you like off body carry. It may not be such, but my opinion is, if it is in the jacket, whether a pocket or a concealed holster, it is not on my person. The jacket might need to be taken off at some point. Then what do you do with the firearm.
Of course, a shoulder holster has a similar problem, if you take the jacket off, the firearm is not concealed, but it is still on your person and in your control.