Just like interior doors (with casing attached instead of brick molding) , it may be easier to install the door without the brick molding installed. If the wall the door is going into is slightly out of plane, you can position the jamb as needed without the brick molding getting in the way.
Having said that, like you, the few doors I have installed had the molding attached already, and it wasn’t really a problem.
Anyway, as I’m sure the wife will be making your favorite dinner afer this project, it won’t hurt to follow her intuition!
Good Luck!