Why did the US Navy not fit the 8-inch/55 Mark 71 gun to the Ticonderoga class?
Short answerBecause of cost, a belief that naval guns were obsolete, and the hull strengthening the installation would require.
NotesThe missed 8-inch-gun option had several linked obstacles. The weapon would cost money, influential decision-makers believed guns had become obsolete, and the cruiser hull would need strengthening to accept it. The design change involved much more than a turret swap. This brief answer connects doctrine and procurement fashion to the structural work required by a much heavier gun system.