Some wifi routers have Internet facing management interfaces that use the same password as the wifi network. Your curt response oversimplifies the situation to

Some wifi routers have Internet facing management interfaces that use the same password as the wifi network. Your curt response oversimplifies the situation to the point where an uninformed reader could mistakenly believe the situation has no impact. Your comment should be read in the light of an engineer not only completely missing the point, but an example of the danger of this type of engineering analysis. Minor technical decisions that "make sense" sometimes have severe technical repercussions.